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

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        
        int n = in.nextInt();
        String s = in.next();
        int cp = 0;
        int pp = 0;
        int vc = 0;
        
        for (int i = 0; i < n; i ++){
            pp = cp;
            if (s.charAt(i) == 'U') cp++;
            if (s.charAt(i) == 'D') cp--;
            if (pp == 0 && cp == -1) vc++;
        }
        
        System.out.println(vc);
    }
}