#include <bits/stdc++.h>
using namespace std;
#define int int64_t
#define ld long double
#define ar array
const int INF = 1e17;
const int MOD = 1e9+7;
int32_t main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int N; cin >> N;
vector<ar<int,2>> adj(N);
for (auto &i : adj) {
cin >> i[0] >> i[1];
if (i[0] > 0) --i[0];
if (i[1] > 0) --i[1];
}
int ans = 0;
function<void(int, int)> dfs = [&](int u, int depth) {
int lc = adj[u][0], rc = adj[u][1];
if (lc < 0) ans = max(-lc * (1 << depth), ans);
else dfs(lc, depth + 1);
if (rc < 0) ans = max(-rc * (1 << depth), ans);
else dfs(rc, depth + 1);
};
dfs(0, 1);
vector<int> remdi;
while (ans) { remdi.push_back(ans & 1); ans >>= 1; }
reverse(remdi.begin(), remdi.end());
for (int i : remdi) cout << i;
}
