#include <bits/stdc++.h>
using namespace std;
int main() {
    long long n, i, j, k, count, c;
    cin >> n;

    long long a[100005] = { 0 };
    for (i = 1; i <= n; i++) {
        a[i] = i / 100000 % 10 + i / 10000 % 10 + i / 1000 % 10 + i / 100 % 10 + i / 10 % 10 + i % 10;
    }

    count = 0;
    for (i = 1; i <= 45; i++) {
        k = 1;
        c = 0;

        for (j = 1; j <= n; j++) {
            if (a[j] == i)
                c++;
            else {
                a[k] = a[j];
                k++;
            }
        }

        count = count + c * c;
        n = n - c;
    }
    cout << count << endl;

    return (0);
}