#include <bits/stdc++.h>
using namespace std;

bool judge(long long a) {
  a = abs(a);
  if (a % 100 == 0) {
    a /= 100;
    while (a > 10) {
      if (a % 10 == 0) a /= 10;
      else return false;
    }
    return true;
  }
  return false;
}

int main(){
  long long a, b; cin >> a >> b;
  if (judge(a) && judge(b)) {
    cout << a * b / 10 << endl;
  } else {
    if (abs(a * b) > 99999999) cout << "E" << endl;
    else cout << a * b << endl;
  }
  return 0;
}