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

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