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

/**************************************************************
	Problem: 1031
	User: xuezihong1
	Language: C++
	Result: Accepted
	Time:20 ms
	Memory:2072 kb
****************************************************************/