P12509_en/S001-AC.cc

#include <iostream>
using namespace std;
int factorial(int n)
{
	if(n < 2)
	{
		return 1;
	}
	return (n)*factorial(n-1);
}
int main()
{
/*
	int a;
	cin >> a;
	cout << factorial(a) << endl;
	return 0;
*/
}