#include <iostream>
using namespace std;

void function(int);

int main()
{
	int a;
	cout<<"a=:";
	cin>>a;
	function(a);
	system("pause");
	return 0;
}

void function(int a)
{
	if(a<1){
		cout<<pow (a,3)+(pow (a,3)+2*a)<<endl;
	} else {
		cout<<(2*(2*a + 5))/(14-(a/3))<<endl;
	}
}