#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  ll a,b;cin>>a>>b;
  if(a%10==0||b%10==0){
    cout<<a*b/10<<endl;
  }else if(a*b<-99999999||a*b>99999999){
    cout<<"E"<<endl;
  }else{
    cout<<a*b<<endl;
  }
}