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) {
        Scanner in = new Scanner(System.in);
        int s = in.nextInt();
        String steps = in.next();
        int lvl = 0;
        int val = 0;
        for (int i=0; i<s; i++) {
            char s_i = steps.charAt(i);
            if (s_i == 'U') {
                if (lvl+1 == 0) val++;
                lvl++;
            }
            else lvl--;
        }
        System.out.println(val);
    }
}