#include <iostream>
using namespace std;
int main()
{int c,s;
 float p,w,d,f;
 cout<<"please enter p,w,s:";
 cin>>p>>w>>s;
 if(s>=3000) c=12;
 else c=s/250;
 switch (c)
 { case 0:d=0;break;
   case 1:d=2;break;
   case 2:
   case 3:d=5;break;
   case 4:
   case 5:
   case 6:
   case 7:d=8;break;
   case 8:
   case 9:
   case 10:
   case 11:d=10;break;
   case 12:d=15;break;
 }
  f=p*w*s*(1-d/100.0);
  cout<<"freight="<<f<<endl;
  return 0;
}