#include<bits/stdc++.h> 
using namespace std;
int main(){
    int c;
    float f;
    cin>>c;
    f=9.0/5*c+32;
    printf("%.2f",f);
} 
/**************************************************************
	Problem: 1031
	User: yangjunwen
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/