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

public class Solution {

    static final char UPHILL = 'U';
    static final char DOWNHILL = 'D';

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        int n = scan.nextInt();
        String steps = scan.next();

        int valleysCount = 0;
        int currentLevel = 0;

        for (int i = 0; i < n; i++) {
            if (steps.charAt(i) == UPHILL) {
                currentLevel += 1;
            } else {
                if (currentLevel == 0) {
                    valleysCount += 1;
                }

                currentLevel -= 1;
            }
        }

        System.out.println(valleysCount);
    }
}