#include<iostream>

using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int a, b;
    cin >> a >> b;
    if (a % 10 == 0 && b % 10 == 0) {
        cout << (long long)a * b / 10 << endl;
    } else {
        long long tmp = (long long)a * b;
        if (-99999999 <= a && a <= 99999999) {
            cout << tmp << endl;
        } else {
            cout << "E" << endl;
        }
    }
}