#include <bits/stdc++.h>
#define rep(i,n) for(int i=0; i<(n); i++)
using namespace std;
typedef long long ll;

int main(){
	ll a,b; cin>>a>>b;
	if(a%10==0&&b%10==0){
		cout << (a*b)/10 << endl;
		return 0;
	}
	if(a*b>99999999||a*b<-99999999) cout << "E" << endl;
	else cout << a*b << endl;	
}