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  1. #include <cstdio>
  2. using namespace std;
  3.  
  4. int main(){
  5.     int n,k;
  6.     double w;
  7.     while(scanf("%d%lf%d",&n,&w,&k)==3){
  8.         n+=2-(n+2)/k;
  9.         printf("%.2f\n",n*w/2+1e-8);
  10.     }
  11. }
  12.  
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https://ideone.com/hkG3IK
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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