#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define FOR(i,b,e) for (int i=(int)(b); i<(int)(e); i++)
#define ALL(x) (x).begin(), (x).end()

const double PI = acos(-1);

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

  long long a, b;
  cin >> a >> b;

  if (a % 100 == 0 && b % 100 == 0) {
    cout << a * b / 10 << endl;
  } else {
    int c = a * b;
    if (-99999999 <= c && c <= 99999999)
      cout << c << endl;
    else
      cout << "E" << endl;
  }
  
  return 0;
}