func_code_string: #include <bits/stdc++.h>   using namespace std;   long long a[10];   int main() {     int n;     while (scanf( %d , &n) != EOF) {       memset(a, 0, sizeof(a));       for (int i = 1; i <= n; ++i) a[i % 9]++;       long long ans = 0;       for (int i = 0; i < 9; ++i)         for (int j = 0; j < 9; ++j) ans += a[i] * a[j] * a[(i * j) % 9];       for (int i = 1; i <= n; ++i) ans -= n / i;       cout << ans << endl;     }     return 0;   }   