#include <bits/stdc++.h>
using namespace std;
int main()
{
int c;
double f;
cin>>c;
f=9.0/5*c+32;
printf("%.2f",f);

return 0;

}

/**************************************************************
	Problem: 1031
	User: mc002
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/