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

/**************************************************************
	Problem: 1031
	User: huangcanwu
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/