func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int n, m, a, n2, m2;     cin >> n >> m >> a;     if ((a * (n / a)) == n)       n2 = n / a;     else       n2 = (n / a) + 1;     if ((a * (m / a)) == m)       m2 = m / a;     else       m2 = (m / a) + 1;     cout << n2 * m2 << endl;     return 0;   }   