#include <iostream>
using namespace std;
double dohod (double L, double p,int d){
     return L*((p/364)*d);
}
int main()
{
      double a,b;
      int c;
      cin>>a>>b>>c;
      cout <<  "Polucenai ssuma: " << dohod(a,b,c);
	  return 0;
}