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();
        String input = in.next();
        char[] inputArr = input.toCharArray();
        int peak = 0;
        int down = 0;
        int centre = 0;
        int count = 0;
        
        for(int i=0;i<inputArr.length;i++){
            if(inputArr[i] == 'U'){
                peak = peak+1;
                centre = centre+1;
                down = down + 1;
                if(down == 0 && peak > 0){
                    count++;
                }
                    
            }else{
                down = down-1;
                centre = centre-1;
            }
                
            
        }
        System.out.println(count);
        
    }
}