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

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 steps =sc.nextInt();
        String b=sc.nextLine();
        b=sc.nextLine();
        int h = 0;
        int res = 0;
        for(int i = 0; i<steps; i++){
            char s = b.charAt(i);
            if(s == 'U'){
                h++;
                if(h == 0){res++;}
            }else{
                h--;
            }
        }
        System.out.println(res);
    }
}