#include <iostream>
using namespace std;
int main()
{
	int c;
	double f;
	cin >> c;
	f = (9.0/5)*c+32;
	printf("%.2f",f);
	cout << endl;
	
}
/**************************************************************
	Problem: 1031
	User: xiaomingze
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/