import java.util.*;

public class App {

    static int gamesCount(int r, int d, int m, int n) {
        // Return the number of games you can buy
        return 0;
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int r = in.nextInt();
        int d = in.nextInt();
        int m = in.nextInt();
        int n = in.nextInt();
        int gamesCount = gamesCount(r, d, m, n);
        System.out.println(gamesCount);
        in.close();
    }
}