#include<bits/stdc++.h>
using namespace std;
int n; 
double f;
int main(){
   cin>>n;
   f=1.8*n*1.0+32;
   printf("%.2f",f);
   return 0;
}

/**************************************************************
	Problem: 1031
	User: chenjingqi
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/