import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int valley = 0;
        int count = 0;
        String str = sc.next();
        char c;
        for(int i = 0; i < n; i++) {
            c = str.charAt(i);
            if(c == 'D')
                valley--;
            else if(c == 'U')
                valley++;
            if(valley == 0 && c == 'U')
                count++;
        }
        System.out.print(count);
    }
}