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

public class Solution {

    public static void main(String[] args) {
        Scanner stdin = new Scanner(System.in);
        int cur = 0, pre = 0, total = 0;
        final int step = stdin.nextInt();
        final String seq = stdin.next();
        for (int i = 0; i < step; i++){
            cur += seq.charAt(i) == 'U' ? 1 : -1;
            if (pre < 0 && cur == 0) total++;
            pre = cur;
        }
        System.out.println(total);
       
    }
}