#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,g;
	cin>>n;
	g=n*3;
	cout<<g;
	
} 

/**************************************************************
	Problem: 1596
	User: zhengzihao3
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/