#include <bits/stdc++.h>
using namespace std;
double c;
double x=9.0/5.0;
int main(){
    cin>>c;
    double f=x*c+32.00;
    printf("%.2f",f);
	return 0;
}
/**************************************************************
	Problem: 1031
	User: zengdongxin
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/