#include <iostream>
using namespace std;

int MultipliedSum(int odd, int even){
    return odd * even;
}

int EvenOrOdd(int singles){

    //checking if the digit is odd or even
    return singles % 2;
}

int main()
{
    int num = -12345;
//    cin >> num;

    int evenSum, oddSum, singles = 0;

    while (num)
    {
        singles = num % 10; //getting the last digit from the number

        if ( EvenOrOdd(singles) )
        {
            evenSum += singles;
        }
        else
        {
            oddSum += singles;
        }

        num /= 10; // removing the last digit from the number
    }

    cout << MultipliedSum(oddSum, evenSum);

    return 0;
}