#include <bits/stdc++.h>
using namespace std;
int main()
{
float f,c;
cin>>c;
f=9/5.0*c+32;
printf("%.2f",f);
	return 0;
}

/**************************************************************
	Problem: 1031
	User: wqc123
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/