import java.util.Scanner;
public class Main {
public static void main
(String[] args
) {
Scanner scanner
= new Scanner
(System.
in);
long A = scanner.nextLong();
long B = scanner.nextLong();
long C = scanner.nextLong();
long D = scanner.nextLong();
scanner.close();
long last2digits = ((A % 100) * (B % 100) % 100 * (C % 100) % 100 * (D % 100)) % 100;
System.
out.
printf("%02d\n", last2digits
); scanner.close();
}
}
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