import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        String s = scanner.next();
        char[] chars = s.toCharArray();
        int h = 0, count = 0;
        boolean isInValley = false;
        for (char c : chars) {
            if (c=='U') h++;
            else h--;
            if (h<0) isInValley = true;
            if (h==0 && isInValley) {
                count++;
                isInValley = false;
            }
        }
        System.out.println(count);
    }
}