#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
     long long int n,i,j,x,y,z;
     vector<long long int>a,b,c,d;
    cin>>n;y=1;
    for(i=0;i<n;i++)
        {
        scanf("%lld",&x);
        a.push_back(x);
    }
    if(n<5)
       z=n-1;
    else
        z=2*n+1;
    cout<<z;
    return 0;
}