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

/**************************************************************
	Problem: 1031
	User: huangluowei
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/