#include <iostream>

using namespace std;

int main()
{
    int n, d = 1;
    cin >> n;
    int matrix[n][n];
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            cin >> matrix[i][j];
            if(i == j)
            {
                d *= matrix[i][j];
            }
        }
    }
    cout << "Answer = " << d << endl;
    return 0;
}