#include <bits/stdc++.h>
using namespace std;
int main(){
	int c;
	cin>>c;
	printf("%.2f",c*1.8+32);
	return 0;
}
/**************************************************************
	Problem: 1031
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/