import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) throws Exception {
		BufferedReader br = 
                      new BufferedReader(new InputStreamReader(System.in));
			
		int steps = Integer.valueOf(br.readLine());
        char [] direction = br.readLine().toCharArray();
        
        int level = 0;
        int valley = 0;
        for(int i = 0; i < steps; i++){
            if(direction[i] == 'U') {
                level++;
                if(level == 0) {
                    valley ++;
                }
            }
            else {
                level--;
            }
        }
		System.out.println(valley);
    }
}