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. */
        
        int valley = 0;
        
        int current = 0;
        
        boolean wasBelow = false;
        
        Scanner scan = new Scanner(System.in);
        
        int numberOfStep = scan.nextInt();
        String upOrDown = scan.next();
        
        for(int i=0;i<numberOfStep;i++){
            if(upOrDown.charAt(i) == 'U'){
                current++;
            }else{
                current--;
            }
            
            //if
            if(wasBelow == true && current >= 0){
                valley++;
            }
            
            //if current is negative(below sea level)
            if(current < 0){
                wasBelow = true;
            }else{
                wasBelow = false;
            }
            
            
        }
        
        System.out.println(valley);
    }
}