#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
int c;
double f;
cin>>c;
f=9.0/5*c+32;
cout<<fixed<<setpercition(2)<<f<<endl;
return 0;
}
/**************************************************************
	Problem: 1031
	User: HUANGYIBO
	Language: C++
	Result: Compile Error
****************************************************************/