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

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner scan = new Scanner(System.in);
        int numLetters = Integer.parseInt(scan.nextLine());
        
        String letters = scan.nextLine();
        
        int sum = 0;
        boolean valleyStarted = false;
        int count = 0;
        
        for (int i = 0; i < numLetters; i++){
            char c = letters.charAt(i);
            
            if (c == 'U'){
                sum++;
            }else if (c == 'D'){
                sum--;
            }
            
            if (!valleyStarted && sum < 0){
                valleyStarted = true;
            }
            
            if (valleyStarted && sum == 0){
                count++;
                valleyStarted = false;
            }
        }
        
        System.out.println(count);
        
        
    }
}