import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        scan.nextLine();
        char[] steps = scan.nextLine().toCharArray();
        int valleys = 0;
        int height = 0;
        for (int i = 0; i < n; i++){
            if (steps[i] == 'U') {
                height++;
            }
            else {
                if (height == 0) valleys++;
                height--;
            }
        }
        System.out.println(valleys);
    }
}