func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 12;   unsigned long long ans;   unsigned long long n;   unsigned long long data[maxn];   void init() {     scanf( %I64d , &n);     memset(data, 0, sizeof(data));     ans = 0;   }   void solve() {     for (int i = 1; i <= n; ++i) {       ++data[i % 9];       ans -= n / i;     }     for (int i = 0; i < 9; ++i)       for (int j = 0; j < 9; ++j) ans += data[i] * data[j] * data[i * j % 9];   }   void write() { printf( %I64d n , ans); }   int main() {     init();     solve();     write();     return 0;   }   