#include <bits/stdc++.h>
using namespace std;
int n,sum;
bool seven(int n)
{
    while (n > 0)
    {
        if (n % 10 == 7)
        {
            return true;
        }
        n = n / 10;
    }
    return false;
}
int main()
{
    cin >> n;
    for (int i = 1;i <= n;i++)
    {
        if (i % 7 == 0 || seven(i))
        {
            sum += i;
        }
    }
    cout << sum;
    return 0;
}