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

#define ll long long

using namespace std;

int main(){

   ll a,b;
   cin>>a>>b;
   
   int fa=a,fb=b;
   if(fa%100||fb%100) fa=fb=0;
   while(fa>9){
       if(fa%10&&fa/10){
           fa=0;
           break;
       }
       fa/=10;
   }
   while(fb>9){
       if(fb%10&&fb/10){
           fb=0;
           break;
       }
       fb/=10;
   }
      if(fa&&fb){
       cout<<a*b/10<<endl;
   }else{
       if(abs(a*b)>99999999) cout<<"E"<<endl;
       else cout<<a*b<<endl;
   }

   return 0;
}