hdu 1396

#include <iostream>
#include <cstdio>
using namespace std;
int count[510];
int main()
{
	count[1]=1;
	int i,j;
	for(i=2;i<=500;i++)
	{
		int t=count[i-1];
		for(j=1;j<=i;j++) t=t+i+1-j;
		for(j=1;i-j>=j;j++) t=t+i-j+1-j;
		count[i]=t;
	}
	int n;
	while(cin>>n) cout<<count[n]<<endl;
	return 0;
}