#include<bits/stdc++.h>
using namespace std;
int main(){
	int c;
	float f;
	cin>>c;
	f=9.0/5*c+32;
	printf("%.2f",f);
}
/**************************************************************
	Problem: 1031
	User: zengyixuan
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/