import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        in.nextLine();
        String s = in.nextLine();

        int count = 0;
        int currentHeight = 0;
        for(int i = 0; i < n; i++){
            boolean up = s.charAt(i) == 'U';
            if(currentHeight == 0 && !up)
                count++;
            currentHeight += up ? 1 : -1;
        }

        System.out.println(count);
    }
}