#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: ccf
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/