#include <iostream>
#include <vector>

using namespace std;

void ispisi(int i, const vector<int> &a, int n) {
    if(i<n) {
        ispisi(2*i+1, a, n);
        cout << a[i] << " ";
        ispisi(2*i+2, a, n);
    }
}

int main() {
    int n;
    cin >> n;
    vector<int> a(n);
    for(int &x : a) cin >> x;
    ispisi(0,a,n);
    return 0;
}