#include<bits/stdc++.h>
using namespace std;
using ll=long long;
int main(){
    int x;
    cin>>x;
    int ans=0,cur=0;
    for(int i=0;i<100;i++){
        if(cur!=x){
            ans+=2;
            cur+=2;
        }else{
            cout<<ans<<endl;
            return 0;
        }
        if(cur!=x){
            ans+=2;
            cur+=2;
        }else{
            cout<<ans<<endl;
            return 0;
        }
        if(cur!=x){
            ans++;
            cur-=1;
        }else{
            cout<<ans<<endl;
            return 0;
        }
        if(cur!=x){
            ans++;
            cur-=1;
        }else{
            cout<<ans<<endl;
            return 0;
        }
        if(cur==x){
            cout<<ans<<endl;
        }else{
            ans+=4;
        }
    }
}