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OI-codes/Luogu/CF1A/CF1A.cpp

13 lines
208 B
C++

// R38986370
#include <bits/stdc++.h>
using namespace std;
int main() {
int a, n, m;
cin >> n >> m >> a;
cout << (long long)(ceil(n / (double)a) * ceil(m / (double)a)) << endl;
return 0;
}