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) {
        Scanner in = new Scanner(System.in);
        int steps = in.nextInt();
        in.nextLine();
        String line = in.nextLine();

        int valley = 0;
        int level = 0;

        for (int i = 0; i < steps; i++) {
            if(line.charAt(i) == 'U') {
                level++;
                if (level == 0) {
                    valley++;
                }
            } else {
                level--;
            }
        }

        System.out.println(valley);
    }
}