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

/**************************************************************
	Problem: 1031
	User: 666
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2076 kb
****************************************************************/