abc188_c

#include <bits/stdc++.h>
using namespace std;

#define int long long

const int N = 2000000;

int a[N];

int f(int l, int r, int b) {
  if (l + 1 < r) {
    int m = (l + r) / 2;
    l = f(l, m, 0);
    r = f(m + 1, r, 0);
  }
  if (b == 0) {
    if (a[l] > a[r]) return l;
    return r;
  }
  else {
    if (a[l] > a[r]) return r;
    return l;
  }
}

signed main() {
  // freopen("in" , "r", stdin );
  cin.tie(0)->sync_with_stdio(0);
  int n; cin >> n;
  n = (1 << n);
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  cout << f(1, n, 1) << '\n';
}