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 sc = new Scanner(System.in);
        sc.nextLine();
        String steps = sc.nextLine();
        int altitude = 0;
        int ans = 0;
        for (int i = 0; i < steps.length(); i++) {
            switch (steps.charAt(i)) {
                case 'U': 
                altitude++;
                if (altitude == 0) {
                    ans++;
                }
                break;
                case 'D':
                altitude--;
                break;
            }
        }
        
        System.out.println(ans);
    }
}