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