#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cmath>
#include <tuple>
#include <bitset>

#define rep(i,n) for(i=0; i<n; ++i)
#define inc_rep(i,a,n) for(i=a; i<n; ++i)
#define dec_rep(i,n,a) for(i=n; i>=a; --i)
#define in(a) cin >> a
#define out(a,b) cout << a << b
#define print_vec(v) for(auto it=v.begin();it!=v.end();++it)cout<<*it <<" ";cout<<endl
#define print_vec2d(v) for(int i=0;i<v.size();++i){for(int j=0;j<v[i].size();++j)cout<<v[i][j]<<" ";cout<<endl;}cout<<endl
using namespace std;
using lint = long long;


int main(void){
    lint i, j, k, cnt=0, x, y;
    lint p, q, n, m;
    in(x);
    lint cur=0;
    vector<lint> v={2,2,-1,-1,2,-1,-1};
    while(true){
        rep(i,v.size()){
            cur+=v[i];
            cnt+=abs(v[i]);
            if(cur==x) break;
        }
        if(cur==x) break;
    }
    out(cnt,endl);

    return 0;
}