#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
#define in(x) freopen(x, "r", stdin)
#define out(x) freopen(x, "w", stdout)
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//#pragma GCC optimize("Ofast,nso-stack-protector,unroll-loops,fast-math,-O3")
//#define F first
//#define S second
#define pb push_back
#define N +1000500
#define M ll(1e9 + 7)
#define sz(x) (int)x.size()
#define re return
#define oo ll(1e9)
#define el '\n'
#define Max_A int(1e9)
//#define el endl
#define pii pair <int, int>
#define err ld(1e-9)
#define Max_S int(3e6)
#define last(x) x.back()
#define all(x) (x).begin(), (x).end()
#define arr_all(x, n) (x + 1), (x + 1 + n)
using namespace std;
//using namespace __gnu_pbds;
//typedef tree <int, null_type, less_equal <int> , rb_tree_tag, tree_order_statistics_node_update> ordered_set;
typedef long long ll;
typedef long double ld;
struct str{
string l, r;
ll le, ri;
};
str f[N];
ll i, n, ans;
string umax(string a, string b)
{
if (sz(a) > sz(b)) return a;
if (sz(a) < sz(b)) return b;
int i = 0;
while (i < sz(a) && a[i] == '1' && b[i] == '1') i++;
if (i == sz(a)) return a;
if (a[i] > b[i]) return a;
else return b;
}
string upd(string x, int type)
{
if (type)
x += "0";
else x.erase(sz(x) - 1);
return x;
}
string rec(ll v)
{
string lF = f[v].l;
string rF = f[v].r;
if (f[v].le != 0) lF = rec(f[v].le);
if (f[v].ri != 0) rF = rec(f[v].ri);
return upd(umax(lF, rF), 1);
}
string bin(ll x)
{
string ans = "";
while (x)
{
if (x & 1)
ans += "1";
else ans += "0";
//ans += char('0' + x & 1);
x >>= 1;
}
reverse(all(ans));
return ans;
}
int main()
{
cout.precision(2);
srand(time(0));
ios_base::sync_with_stdio(0);
iostream::sync_with_stdio(0);
ios::sync_with_stdio(0);
cin.tie(NULL);
cout.tie(NULL);
// in("input.txt");
// out("output.txt");
cin >> n;
for (i = 1; i <= n; i++)
{
ll l, r;
cin >> l >> r;
if (l > 0) f[i].le = l; else f[i].l = bin(-l);
if (r > 0) f[i].ri = r; else f[i].r = bin(-r);
}
cout << upd(rec(1), 0) << "0";
}
//
//00000
//00110
//00111
//00011
//00000
