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

public class Solution {

   public static void main(String[] args) {
        int count = 0,total = 0;
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        in.nextLine();
        String s = in.nextLine();
        String[] arr = s.split("(?<!^)");
        for (int i = 0; i < n; i++) {
            if("U".equals(arr[i])){
                count++;
                if(count == 0)
                    ++total;
            }else if("D".equals(arr[i])){
                count--;
                
            }
        }
        System.out.println(total);
        
    }
}