//?????,?????7??,????????????????????7,
//?????7????.????????n(n<100)??7??????????. 
int main()
{
	int n,i,a[100],sum=0;
	cin>>n;
	for (i=0;i<=n-1;i++)
	{
		a[i]=i+1;                                          //?????
		if (a[i]%7==0||a[i]/10==7||(a[i]-a[i]/10*10==7))   //?????7??
			a[i]=0;                                        //?????0
		sum+=a[i]*a[i];                                    //?????
	}
	cout<<sum<<endl;                                       //????
	return 0;
}