10 lines
178 B
C++
10 lines
178 B
C++
#include<cstdio>
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#include<cmath>
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int main()
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{
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int n,m,a;
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scanf("%d%d%d",&n,&m,&a);
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printf("%lld\n",(long long)(ceil((double)n/a)*ceil((double)m/a)));
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return 0;
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}
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