import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.List;
import java.util.Queue;

public class E2 {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		outer:
		for(int T = ni();T >= 1;T--){
			int n = ni();
			reg = ns().toCharArray();
			len = reg.length;
			pos = 0;
			Node[] nodes = expr();
			if(pos != len)throw new AssertionError(pos);
//			for(Node a : all){
//				tr(a);
//			}
			
			boolean[][] dist = new boolean[501][all.size()];
			dist[0][nodes[0].id] = true;
			
			Queue<int[]> q = new ArrayDeque<int[]>();
			q.add(new int[]{0, nodes[0].id});
			while(!q.isEmpty()){
				int[] curs = q.poll();
				int d = curs[0];
				Node cur = all.get(curs[1]);
				for(Edge e : cur.next){
					int dd = e.c == '!' ? 0 : 1;
					if(d + dd <= 500 && !dist[d+dd][e.to.id]){
						dist[d+dd][e.to.id] = true;
						q.add(new int[]{d+dd, e.to.id});
					}
				}
			}
			
			for(int i = n;i <= 500;i++){
				if(dist[i][nodes[1].id]){
					out.println(i);
					continue outer;
				}
			}
			out.println(-1);
		}
	}
	
		static char[] reg;
		static int pos, len;
		static List<Node> all = new ArrayList<Node>();
		
		// (src,dst)
		static Node[] expr()
		{
			List<Node[]> items = new ArrayList<Node[]>();
			items.add(item());
			while(pos < len){
				if(reg[pos] == ')')break;
				if(reg[pos] != '|')throw new AssertionError(pos);
				pos++;
				items.add(item());
			}
			if(items.size() == 1){
				return items.get(0);
			}else{
				Node src = new Node();
				Node dst = new Node();
				for(Node[] item :items){
					src.linkEpsilon(item[0]);
					item[1].linkEpsilon(dst);
				}
				return new Node[]{src, dst};
			}
		}
		
		static Node[] item()
		{
			Node[] ret = clus();
			while(pos < len){
				if(reg[pos] == ')' || reg[pos] == '|')break;
				Node[] nex = clus();
				ret[1].linkEpsilon(nex[0]);
				ret[1] = nex[1];
			}
			return ret;
		}
		
		static Node[] clus()
		{
			Node[] unit = unit();
			if(pos < len && reg[pos] == '*'){
				pos++;
				Node src = new Node();
				Node dst = new Node();
				src.linkEpsilon(dst);
				src.linkEpsilon(unit[0]);
				unit[1].linkEpsilon(unit[0]);
				unit[1].linkEpsilon(dst);
				return new Node[]{src, dst};
			}
			return unit;
		}
		
		static Node[] unit()
		{
			if(pos == len)throw new AssertionError(pos);
			if(reg[pos] == '('){
				pos++;
				Node[] expr = expr();
				if(!(pos < len && reg[pos] == ')'))throw new AssertionError(pos);
				pos++;
				return expr;
			}else{
				if(reg[pos] == ')' || reg[pos] == '|' || reg[pos] == '*')throw new AssertionError(pos);
				Node src = new Node();
				Node dst = new Node();
				src.link(dst, reg[pos]);
				pos++;
				return new Node[]{src, dst};
			}
		}
		
		static class Edge
		{
			public char c;
			public Node to;
		
			public Edge(char c, Node to) {
				this.c = c;
				this.to = to;
			}
			
			public String toString()
			{
				return c + ":" + to.id;
			}
		}
		
		static int idbase = 0;
		
		static class Node
		{
			public List<Edge> next;
			public int id;
			
			public Node()
			{
				all.add(this);
				next = new ArrayList<Edge>();
				id = idbase++;
			}
			
			public void link(Node to, char c)
			{
				next.add(new Edge(c, to));
			}
			
			public void linkEpsilon(Node to)
			{
				next.add(new Edge('!', to));
			}

			@Override
			public String toString() {
				StringBuilder builder = new StringBuilder();
				builder.append("Node [next=");
				builder.append(next);
				builder.append(", id=");
				builder.append(id);
				builder.append("]");
				return builder.toString();
			}
		}

	
	void run() throws Exception
	{
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
	}
	
	public static void main(String[] args) throws Exception { new E2().run(); }
	
	private byte[] inbuf = new byte[1024];
	private int lenbuf = 0, ptrbuf = 0;
	
	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }
	
	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	
	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}
	
	private char[][] nm(int n, int m)
	{
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}
	
	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private int ni()
	{
		int num = 0, b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}