#include<bits/stdc++.h>
using namespace std;
int main()
{int c;
 scanf("%d",&c);
 float f;
 f=9.0/5*c+32;
 printf("%.2f",f);
return 0;
}

/**************************************************************
	Problem: 1031
	User: cx002
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2076 kb
****************************************************************/