include <bits/stdc++.h>

using namespace std; class Otaq{ public : int n,m,k; void otaqinfo(){ cout << (n/k)*(m/k) << endl; } }; int main(){ int n,m,k; cin >> n >> m >> k; Otaq o; o.n=n; o.m=m; o.k=k; o.otaqinfo(); }

//kocurme imtahana az qalff