#include<bits/stdc++.h>
using namespace std;
int main() {
    int x;
    cin>>x;
    cout<<x*3<<endl<<x*3-8<<endl;
    printf("%.1f",(x+x*3+(x*3-8))/3.0);
    return 0;
}
/**************************************************************
	Problem: 1601
	User: panjinyan
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/