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

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int current_level = 0;
        int valley = 0;
        int mountain = 0;
        String str = in.next(); 
        char[] level = str.toCharArray();
        
        for(int x=0; x < n; x++) {    
          
            if(current_level == 0) {
                if(level[x] == 'U')
                    mountain++;
                else if(level[x] == 'D')
                    valley++;
            }
            
            if(level[x]=='U')
                current_level++;
            
            else if(level[x]=='D')
                current_level--;
          
        }
    
    
        System.out.println(valley);
    }
}