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

public class Solution {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int n = input.nextInt();
        String s = input.next();
        valleys(s);
    }
    
    public static void valleys(String s){
        int seaLevel = 0;
        int valleys = 0;
        boolean underSeaLevel = false;
        int sL = s.length();
        for(int i = 0; i < sL ; i++){
            if(seaLevel == 0 && underSeaLevel == true){
                underSeaLevel = false;
                
            } 
            else if(seaLevel < 0 && underSeaLevel == false){
                underSeaLevel = true;
                valleys ++;
             }
            
            if(s.charAt(i) == 'U' ){
                seaLevel++;
            }
            else if(s.charAt(i) == 'D'){
                seaLevel--;
            }
      }
        
        System.out.println(valleys);
    }
}