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

/**************************************************************
	Problem: 1005
	User: lzc
	Language: C++
	Result: Wrong Answer
****************************************************************/