#include<bits/stdc++.h>
using namespace std;
int main(){
    int i;
    float x=0,z=0,p;
    cin>>i;
    x=i*3;
    z=x-8;
    cout<<x<<endl<<z<<endl;
    p=(x+i+z)/3;
    printf("%.1lf",p);
} 
/**************************************************************
	Problem: 1601
	User: linyuhang
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/