#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; }