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12 lines
233 B
JavaScript
12 lines
233 B
JavaScript
const line = readline();
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const parts = line.split(" ").map(Number);
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var n = parts[0];
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var m = parts[1];
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var a = parts[2];
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var tilesN = Math.floor((n + a - 1) / a);
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var tilesM = Math.floor((m + a - 1) / a);
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print(tilesN * tilesM);
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