int main()
{
	int n;
	scanf("%d",&n);
	int i,j,s,g,shi;
	s=0;
	for(i=1;i<=n;i++)
	{
        
		j=i;
		if(i%7==0)
			j=1;
		else
		{
			g=i%10;
			shi=(i-g)/10;
			if((g==7)||(shi==7))
				j=1;
			else
				s=s+j*j;
		}
	}
	printf("%d",s);
	return 0;
}