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) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        in.nextLine();
        int elevation_tracker = 0;
        int valley_counter = 0;
        boolean valley_status = false;
        String path = in.next();
        for (int index = 0; index < n; index++){
            char aChar = path.charAt(index);
            if (aChar == 'U'){
                elevation_tracker++;
            }
            else{
                elevation_tracker--;
            }
            if (elevation_tracker < 0){
                valley_status = true;
            }
            else{
                if (valley_status == true){
                    valley_counter++;
                    valley_status = false;
                }
                else{
                }
            }
        }
        System.out.println(valley_counter);
        
    }
}