#include <iostream>
#include <iomanip>

using namespace std;

// Recursive function.
long multiply(int i, int j)
{
    // Base cases.
    if (i == 0) return 0;
    if (i == 1) return j;

    // Recursive case.
    return multiply(i - 1, j) + j;
}

int main()
{
    int n1 = 6;
    int n2 = 9;
    long product = multiply(n1, n2);

    cout << "The product of " << n1 << " and " << n2 << " is "
         << product << endl;
}