#include <iostream>
using namespace std;

int main(void){
	int a,b;
	int ans;

	cin>>a>>b;

	if(a%10==0 && b%10==0){
		cout<<a*b/10<<"\n";
		return 0;
	}

	ans=a*b;

	if(-99999999<=ans && ans<=99999999){
		cout<<ans<<"\n";
	}
	else{
		cout<<"E\n";
	}

	return 0;
}