22 lines
371 B
C++
22 lines
371 B
C++
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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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{
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long long n, m, a, div, len, wid;
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cin >> n >> m >> a;
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div = n / a;
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if (n % a == 0)
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len = div * a;
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else
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len = (div + 1) * a;
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div = m / a;
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if (m % a == 0)
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wid = div * a;
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else
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wid = (div + 1) * a;
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div = (len * wid) / (a * a);
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cout << div;
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}
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