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

public class Solution {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        String input = scanner.next();
        int seaLevel = 0;
        int count = 0;
        boolean hisDown = false;
        for (int i = 0; i < input.length(); i++) {
            if (input.charAt(i) == 'U') seaLevel++;
            else if (input.charAt(i) == 'D') seaLevel--;
            if (seaLevel < 0 && hisDown == false){
                hisDown = true;
                count++;
            }
            else if (seaLevel >= 0 && hisDown == true ){
                hisDown = false;
            }
        }
        System.out.println(count);
    }
}