29 lines
266 B
C++
29 lines
266 B
C++
#include<iostream>
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#include<string>
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#include<vector>
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using namespace std;
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int main(){
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int m,n,a;
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cin >> m >> n >> a;
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if(m%a == 0){
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m = m/a;
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}
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else{
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m = m/a + 1;
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}
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if(n%a == 0){
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n = n/a;
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}
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else{
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n = n/a + 1;
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}
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cout << m*n;
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return 0;
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}
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