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) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int down = 0, up = 0, count = 0;
        boolean flag = false;
        String s = sc.next();
        
        for(int i=0;i<n;i++){
            
            if(down == up){
                flag = true;
            }
            char c = s.charAt(i);
            if(c == 'D'){
                if(down == up){
                    count++;
                }
                down++;
            }
            if(c == 'U'){
                up++;
            }
        }
        System.out.println(count);
    }
}