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

public class Solution {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int count = sc.nextInt();
        String track = sc.next();

        int level = 0;
        boolean inValley = false;
        int valleys = 0;
        for (int i = 0; i < count; i++) {
            char step = track.charAt(i);

            if (step == 'U') {
                level++;
                if (level == 0 && inValley) {
                    valleys++;
                    inValley = false;
                }
            } else if (step == 'D') {
                level--;
                if (level < 0 && !inValley) {
                    inValley = true;
                }
            }
        }

        System.out.println(valleys);
    }
}