#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n,num = 0,shiwei1,shiwei2;
    cin >> n;
    for (int i = 1;i <= n;i++)
    {
        if (i % 10 == 7)
        {
            num += i;
            continue;
        }
        shiwei1 = i%10;
        shiwei2 = i - shiwei1;
        if (shiwei2 / 10 == 7)
        {
            num += i;
            continue;
        }
        if (i % 7 == 0)
        {
            num += i;
            continue;
        }
    }
    cout << num;
}