#include <iostream>

#define MAX 99999999

int main(void)
{
    long long a, b;
    std::cin >> a >> b;
    
    if(((a % 100) == 0) && ((b % 100) == 0))
    {
        long long aa = abs(a), bb = abs(b);
        while(((aa % 10) != 0) && ((bb % 10) != 0))
        {
            if((aa % 10) == 0)
                aa /= 10;
            
            if((bb % 10) == 0)
                bb /= 10;
        }
        
        if((aa <= 9) && (bb <= 9))
        {
            std::cout << ((a * b) / 10) << std::endl;
            return 0;
        }
    }
    
    if((long long)abs(a) * (long long)abs(b) > MAX)
    {
        std::cout << "E" << std::endl;
        return 0;
    }
    
    

    std::cout << (a * b) << std::endl;
    return 0;
}