#include <iostream>
using namespace std;
int main()
{
    int a,sum = 0;
    cin >> a;
    for (int i = 1;i <= a;i++)
    {
        if(i % 7 == 0)
        {
            sum += i;
        } else {
            int c = i;
            while(c > 0) {
                int d = c % 10;
                if(d == 7) {
                    sum += i;
                    break;
                } 
                c = c / 10;                
            }

        }
    }
    cout << sum;
}