func_code_string: #include <bits/stdc++.h>   #pragma GCC optimize( Ofast )   #pragma GCC target( avx,avx2,fma )   using namespace std;   int main() {     {       long long n, m, k, p, s, k1, p1;       cin >> n >> m >> s;       if (s == 1) {         cout << n * m;         return 0;       }       k = (n - 1) % s + 1;       k1 = n / s;       if (n % s != 0) k1++;       k = k1 * k;       p = (m - 1) % s + 1;       p1 = m / s;       if (m % s != 0) p1++;       p = p1 * p;       cout << p * k;       cout <<   n ;     }     return 0;   }   