#include<iostream>
#include<iomanip>
using namespace std;
int main(){
	int c;
	cin>>c;
	double f=9.0/5*c+32;
	printf("%.2f",f);

}
/**************************************************************
	Problem: 1031
	User: zhuangsongyu
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/