import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long a = sc.nextInt();
        long b = sc.nextInt();
        if (check(a) && check(b)) {
            System.out.println(a * b / 10);
        } else if (a * b >= -99999999 && a * b <= 99999999) {
            System.out.println(a * b);
        } else {
            System.out.println("E");
        }
    }
    
    static boolean check(long x) {
        if (x == 0) {
            return false;
        }
        long y = Math.abs(x);
        int count = 0;
        while (y % 10 == 0) {
            count++;
            y /= 10;
        }
        return (y < 10 && count >= 2);
    }
    
}