import java.util.*;

public class Main {
    private static Scanner sc = new Scanner(System.in);
    public static void main(String[] args) throws Exception {
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int d = sc.nextInt();
        int ret = mod(mod(a,d)*mod(b,d)*mod(c,d),d);
        System.out.println(ret);
    }
    
    public static int mod(int a, int b) {
        return a%b;
    }
}