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

public class Solution {

    public static void main(String[] args)throws IOException {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int level=0, prev_level=0;
        int n = Integer.parseInt(br.readLine());
        String s = br.readLine();
        int counter=0;
        for(int i=0;i<n;i++){
            prev_level=level;
            if(s.charAt(i)=='U')
                level++;
            else
                level--;
            if(level==0 && prev_level<0)
                counter++;        
        }
        System.out.println(counter);
    }
}