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

public class Solution {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        sc.nextLine();
        String b = sc.nextLine();
        char[] a = b.toCharArray();
        int v = 0;
        int seaLevel = 0;
        for (int i = 0; i < n; i++) {

            if (a[i] == 'U') {
                v = (++seaLevel == 0) ? ++v : v;
            } else {
                seaLevel--;
            }

        }
        System.out.println(v);
    }
}