#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 piii pair <int, pair <int, int> >
#define psi pair <string, 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;
pair <int, int> f[N];
int st[60];
int i, n;
piii umax(piii a, piii b)
{
if (a.S.S > b.S.S) return a;
if (a.S.S < b.S.S) return b;
for (int i = 31; i >= 0; i--)
{
if ((a.F & st[i]) > (b.F & st[i])) return a;
if ((a.F & st[i]) < (b.F & st[i])) return b;
}
}
piii upd(piii x)
{
x.S.F++;
x.S.S++;
return x;
}
string bin(ll x)
{
string ans = "";
if (x == 0) ans = "0";
while (x)
{
if (x & 1)
ans += "1";
else ans += "0";
//ans += char('0' + x & 1);
x >>= 1;
}
reverse(all(ans));
return ans;
}
piii make(int x)
{
string a = bin(x);
return {x, {0, sz(a)}};
}
piii rec(ll v)
{
piii lF;
piii rF;
if (f[v].F > 0) lF = rec(f[v].F); else lF = make(-f[v].F);
if (f[v].S > 0) rF = rec(f[v].S); else rF = make(-f[v].S);
return upd(umax(lF, rF));
}
string restore(piii x)
{
string ans = bin(x.F);
for (int i = 0; i < x.S.F; i++) ans += "0";
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");
// in("17.in");
// out("output.txt");
cin >> n;
st[0] = 1;
for (i = 1; i < 32; i++) st[i] = st[i - 1] * 2;
for (i = 1; i <= n; i++)
{
int l, r;
cin >> l >> r;
f[i] = {l, r};
}
cout << restore(rec(1)) << el;
}
//
//00000
//00110
//00111
//00011
//00000
