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

public class Solution {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        scan.nextLine();
        int level = 0;
        int valleys = 0;
        String steps = scan.nextLine();
        for(int i = 0; i < n; i++) {
            switch(steps.charAt(i)) {
            case 'D':
                if(level == 0) {
                    valleys++;
                }
                level--;
                break;
            case 'U':
                level++;
                break;
            }
        }
        System.out.println(valleys);
    }
}