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