#include<bits/stdc++.h>
using namespace std;
int main(){
	float c;
	cin>>c;
	printf("%.2f",9.0/5.0*c+32.0);
}
/**************************************************************
	Problem: 1031
	User: linmiaoling
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/