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import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class task1A { /* ТеаÑÑалÑÐœÐ°Ñ Ð¿Ð»ÐŸÑÐ°ÐŽÑ Ð² ÑÑПлОÑе ÐеÑлÑМЎОО пÑеЎÑÑавлÑÐµÑ ÑПбПй пÑÑЌПÑгПлÑМОк nâÃâm ЌеÑÑПв. ÐП ÑлÑÑÐ°Ñ ÐŸÑеÑеЎМПгП ÑÐ±ÐžÐ»ÐµÑ Ð³ÐŸÑПЎа, бÑлП пÑОМÑÑП ÑеÑеМОе П заЌПÑеМОО плПÑаЎО кваЎÑаÑÐœÑЌО гÑаМОÑÐœÑЌО плОÑаЌО. ÐÐ°Ð¶ÐŽÐ°Ñ Ð¿Ð»ÐžÑа ÐžÐŒÐµÐµÑ ÑÐ°Ð·ÐŒÐµÑ aâÃâa. ÐакПе МаОЌеМÑÑее кПлОÑеÑÑвП Ð¿Ð»ÐžÑ Ð¿ÐŸÐœÐ°ÐŽÐŸÐ±ÐžÑÑÑ ÐŽÐ»Ñ Ð·Ð°ÐŒÐŸÑÐµÐœÐžÑ Ð¿Ð»ÐŸÑаЎО? РазÑеÑеМП пПкÑÑÑÑ Ð¿Ð»ÐžÑаЌО бПлÑÑÑÑ Ð¿ÐŸÐ²ÐµÑÑ
МПÑÑÑ, ÑеЌ ÑеаÑÑалÑÐœÐ°Ñ Ð¿Ð»ÐŸÑаЎÑ, МП ПМа ЎПлжМа бÑÑÑ Ð¿ÐŸÐºÑÑÑа ПбÑзаÑелÑМП. ÐÑаМОÑÐœÑе плОÑÑ ÐœÐµÐ»ÑÐ·Ñ Ð»ÐŸÐŒÐ°ÑÑ or ÐŽÑПбОÑÑ, а ÑазÑеÑеМП ОÑпПлÑзПваÑÑ ÑПлÑкП ÑелОкПЌ. ÐÑаМОÑÑ Ð¿Ð»ÐžÑ ÐŽÐŸÐ»Ð¶ÐœÑ Ð±ÑÑÑ Ð¿Ð°ÑаллелÑÐœÑ Ð³ÑаМОÑаЌ плПÑаЎО. ÐÑ
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ÑОÑла n,âm О a (1ââ€ân,âm,âaââ€â10^9). ÐÑÑ
ПЎМÑе ЎаММÑе ÐÑвеЎОÑе ОÑкПЌПе кПлОÑеÑÑвП плОÑ. */ public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String[] s=reader.readLine().split(" "); long n = Long.parseLong(s[0]); long m = Long.parseLong(s[1]); long a = Long.parseLong(s[2]); reader.close(); long cntSide1 = n/a + (int) Math.signum(n%a); long cntSide2 = m/a + (int) Math.signum(m%a); System.out.print(cntSide1*cntSide2); } }
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