#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <complex>
#include <stack>
#include <queue>
#include <list>
#include <unordered_map>
#include <utility>
#include <map>
#include <set>
using namespace std;

int main(){
    long long int a, b;
    long long int ans;
    cin >> a >> b;
    if(a%100 == 0 && b%100 == 0){
        cout << a*b/10 << endl;
    }else{
        ans = a*b;
        if(ans >= -99999999 && ans <= 99999999){
            cout << ans << endl;
        }else{
            cout << "E" << endl;
        }
    }
}