#include <iostream>
using namespace std;
int main()
{
int n;
cin >> n;
if (n % 2 == 0) {
n *= 8;
}
else {
n *= 9;
cout << n;
#include <iostream>
using namespace std;
int main()
{
int n;
cin >> n;
if (n % 2 == 0) {
n *= 8;
}
else {
n *= 9;
}
cout << n;
}