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