theatre square codeforces solution
//Hello Kumkum, This code is constributed by me!! Tanishqqqqqq
#include <bits/stdc++.h>
using namespace std;
int main()
{
double n, m, a;
cin >> n >> m >> a;
cout << (long long)ceil(n / a) * (long long)ceil(m / a) << endl;
}Copyright © 2021 Codeinu
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