#include <bits/stdc++.h>
using namespace std;

int main()
{
long long A;
long long B;
long long X;
	
	ios::sync_with_stdio( false );
	cin.tie( 0 );

	cin >> A;
	cin >> B;

	if( A % 100 == 0 && B % 100 == 0 )
	{
		cout << A * B / 10 << endl;

		return 0;
	}

	X = A * B;
	if( -99999999 <= X && X <= 99999999 )
		cout << X << endl;
	else
		cout << "E" << endl;

	return 0;
}