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

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        String str = in.next();
        
        
        char hike[] = str.toCharArray();
        int count = 0;

        int nivel = 0;
        for (char ss : hike) {
            if (ss == 'U') {
                nivel++;
                if (nivel == 0) {
                    count++;
                }
            }
            if (ss == 'D') {
                nivel--;
            }
        }
        
        System.out.println(count);
    }
}