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

public class Solution {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        final int st = sc.nextInt();
        String route = sc.next();
        System.out.println(levels(route));

    }
    
    
    public static int levels(String steps){
        final int st = steps.length();
        int count = 0;
        int valleys = 0;
        int stepsBelow = 0;
        for(int i = 0; i < st; i++){
            if(steps.charAt(i) == 'U'){
                count++;
            }else{
                count--;
            }
            if(count <0){
                stepsBelow++;
            }else if(count == 0 && stepsBelow > 0){
                valleys ++;
                stepsBelow = 0;
            }
        }
        return valleys;
    }
  
}