import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        
        try{
        int steps= Integer.parseInt(br.readLine());
        String[] order = br.readLine().split("");
            br.close();
            int cur = 0,count=0;
        for(int i=0;i<order.length;i++){
            if(order[i].equals("D")){ 
                if(cur==0) 
                    count++; 
                cur--;
            }
            else if(order[i].equals("U"))cur++;
        }
        System.out.println(count);
        }catch(IOException io){
            
        }
        
    }
}