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 string = input.next();
    char[] path = string.toCharArray();
    int height = 0;
    int valleys = 0;
    

       
               for(int i = 0; i<n; i++){
               if(height == 0 && path[i] == 'D') valleys++;
                   

               if(path[i]=='U') height++;
               if(path[i]=='D') height--;  
               }
            
        
        System.out.println(valleys);
        
        
    }
}