#include<bits/stdc++.h>
using namespace std;
int main()
{
   int c;
   float f;
   cin>>c;   
   f=9.0/5*c+32;
   printf("%.2f",f);		
	return 0;
} 
/**************************************************************
	Problem: 1031
	User: LYY001
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/