#include<stdio.h>
int main()
{
	int n;
	int sum=0;
	scanf("%d",&n);
	for(int i = 1; i <= n; i++)
	{
		if(i%7==0)
			continue;
		int m = i;
		while(m > 0)
		{
			if(m%10==7)
			{
				m = 7;
				break;
			}
			m/=10;
		}
		if(m == 7)
			continue;
		sum+=i*i;
	}
	printf("%d\n",sum);
	return 0;
}