#include<iostream>
#include<vector>
#include<stdlib.h>
#include<time.h>
#include<math.h>
#include<string.h>
#include<algorithm>
#include<queue>
#include<map>
#include<iomanip>
using namespace std;

int main(void){
 int A,B;
 long long int mul=0;
 int error=0;
 cin>>A>>B;
 if(A%10==0 && B%10==0){
  mul=(long long int)A*B/10;
 }
 else{
  mul=A*B;
  if(mul<-99999999||mul>99999999)error=1;
 }
 
 if(error==0)std::cout<<mul<<std::endl;
 else std::cout<<"E"<<std::endl;
}