#include <iostream>
#include <algorithm>
#include <cstdio>
#include <string>

#define ll long long

using namespace std;

int main(){

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

   if(a%10==0&&b%10==0){
       cout<<a*b/10<<endl;
   }else{
       if(abs(a*b)>=99999999) cout<<"E"<<endl;
       else cout<<a*b<<endl;
   }

   return 0;
}