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

public class Solution {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);   
        int n = scan.nextInt(); scan.nextLine();
        String sequence = scan.nextLine();
        int count = 0;
        int altitude = 0;
        for (int i = 0; i < n; i++) {            
            char step = sequence.charAt(i);
            
            if (altitude == 0 && step == 'D') {
                count++;
            }
            if (step == 'U') {
                altitude++;
            } else if (step == 'D') {
                altitude--;
            }
           
        }
        System.out.println(count);
    }
}