#include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = long double;

const double PI = 3.1415926535897932384626433832795;

const int dx[] = { 0, 1, 0, -1 };
const int dy[] = { -1, 0, 1, 0 };

int gcd(int x, int y) { return y ? gcd(y, x % y) : abs(x); }
ll gcd(ll x, ll y) { return y ? gcd(y, x % y) : abs(x); }
int lcm(int x, int y) { return x / gcd(x, y) * y; }
ll lcm(ll x, ll y) { return x / gcd(x, y) * y; }

bool isMentalArithmetic(ll aa, ll bb) {
	ll a = aa, b = bb;

	ll n = 0;
	while (a % 10 == 0) {
		a /= 10;
		n++;
	}

	ll m = 0;
	while (b % 10 == 0) {
		b /= 10;
		m++;
	}

	return
		a <= 9 && n >= 2 &&
		b <= 9 && m >= 2;

}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	ll a, b;
	cin >> a >> b;

	ll res = a * b;
	if (isMentalArithmetic(a, b)) {
		res /= 10LL;
		cout << res << endl;
	} else {
		cout << (-99999999 <= res && res <= 99999999 ? to_string(res) : "E") << endl;
	}
	return 0;
}