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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. int n,m,a;
  6. cin>>n>>m>>a;
  7. cout<<(long long)(m*n*2)/(a*a);
  8. return 0;
  9. }
Success #stdin #stdout 0.01s 5308KB
stdin
6 6 4
stdout
4