#include <iostream>
using namespace std;
int main()
{
	int c;
	double f;
	cin >> c;
	f = 9/5*3+32;
	printf("%.2f",f);
	cout << endl;
	
}
/**************************************************************
	Problem: 1031
	User: xiaomingze
	Language: C++
	Result: Wrong Answer
****************************************************************/