#include <bits/stdc++.h>   using namespace std;   long long a, b, c, d, e, t1, t2, t3;   long long la, lb, lc;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     long long n, m, s;     cin >> n >> m >> s;     a = 0;     b = 0;     long long i = 0;     c = 1;     if (s <= n) {       while (i < n) {         if (i + s < n) {           i += s;           ++c;         } else {           a = n - (i + 1);           ++a;           break;         }       }     } else {       c = n;       a = 1;     }     i = 0;     d = 1;     if (s <= m) {       while (i < m) {         if (i + s < m) {           i += s;           ++d;         } else {           b = m - (i + 1);           ++b;           break;         }       }     } else {       d = m;       b = 1;     }     e = c * d;     t1 = a * b;     cout << t1 * e;     return 0;   }   