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

public class Solution {

    public static void main(String args[]){
        int level = 0;
        int valCount = 0;
        Scanner s = new Scanner(System.in);
        int count = s.nextInt();
        s.nextLine();
        char ch[] = s.next().toCharArray();
        
        for(int i = 0; i < count; i++){
            if(ch[i] == 'U'){
                level++;
                if(level == 0){
                    valCount++;
                }
            }else{
                level--;
            }
        }//end for
        System.out.println(valCount);
    }//end of main
}