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

public class Solution {

    public static void main(String[] args) {
        int level = 0;
        int valleys = 0;
        
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        String s = in.next();
        in.close();
        
        char steps[] = s.toCharArray();
        
        for(int i = 0; i < n; i++){
            if (steps[i] == 'U'){
                level++;
            }
            else if(steps[i] == 'D'){
                if(level == 0){
                    valleys++;
                }
                level--;
            }
        }
        System.out.println(valleys);
    }
}