#include<iostream>
#include<iomanip>
using namespace std;
int main(){
	int c;
	cin>>c;
	double f=9.0/5*c+32;
	cout<<fixed<<setprecision(2)<<f<<endl;
	return 0;
}
/**************************************************************
	Problem: 1031
	User: linyuhang
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/