#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,z; 
	cin>>n;
    z=n*3;
    cout<<z;
}
/**************************************************************
	Problem: 1596
	User: wangyiyang
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/