#include<bits/stdc++.h>
using namespace std;
//#include<ext/pb_ds/assoc_container.hpp>
//#include<ext/pb_ds/tree_policy.hpp>
//
// #pragma GCC optimize("unroll-loops")
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("-O3")
// #pragma GCC optimize("no-stack-protector")
// #pragma GCC optimize("fast-math")
//#define LOCAL
#define sim template < class c
#define ris return * this
#define dor > debug & operator <<
#define eni(x) sim > typename \
enable_if<sizeof dud<c>(0) x 1, debug&>::type operator<<(c i) {
sim > struct rge { c b, e; };
sim > rge<c> range(c i, c j) { return rge<c>{i, j}; }
sim > auto dud(c* x) -> decltype(cout << *x, 0);
sim > char dud(...);
struct debug {
#ifndef LOCAL
~debug() { cout << endl; }
eni(!=) cout << boolalpha << i; ris; }
eni(==) ris << range(begin(i), end(i)); }
sim, class b dor(pair < b, c > d) {
ris << "(" << d.first << ", " << d.second << ")";
}
sim dor(rge<c> d) {
*this << "[";
for (auto it = d.b; it != d.e; ++it)
*this << ", " + 2 * (it == d.b) << *it;
ris << "]";
}
#else
sim dor(const c&) { ris; }
#endif
};
#define imie(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "
#define fi first
#define f first
#define se second
#define s second
#define vi_a vector<int>a;
#define p_b push_back
////////////////////////////////???????????????CHECK THIS OUT???????????????//////////////////////////////
#define ll long long
////////////////////////////////???????????????CHECK THIS OUT???????????????//////////////////////////////
#define ld long double
#define pll pair<ll,ll>
#define pii pair<int,int>
#define m_p make_pair
#define fast_io cin.tie(0);cout.tie(0);ios_base::sync_with_stdio(0);
#define all(x) x.begin(),x.end()
#define getfiles ifstream cin("input.txt");ofstream cout("output.txt");
#define pw(x) (1ll << x)
#define sz(x) (ll)x.size()
#define endl "\n"
#define rall(x) x.rbegin(),x.rend()
#define len(a) (ll)a.size()
#define rep(x,l,r) for(ll x=l;x<r;x++)
//using namespace __gnu_pbds;
ld eps = (ld)1 / 1e6;
const ld pi=3.14159265359;
ll inf = 1e18,mod1=1e9+7;
ll sqr(ll a) { return a * a; }
ll qb(ll a) { return a * a * a; }
ll gcd(ll a, ll b) { return !a ? b : gcd(b % a, a); }
void binary(ll val,int to) {for(int i=0;i<to;i++) cerr<<(pw(i) & val ? 1 : 0); cerr<<endl;}
ll binpow(ll a, ll b, ll mod) { return b ? (b % 2 ? (a * (sqr(binpow(a, b / 2, mod)) % mod)) % mod : sqr(binpow(a, b / 2, mod)) % mod) : 1; }
ll binmult(ll a, ll b, ll mod) { return b ? (b % 2 ? (2 * binmult(a, b / 2, mod) + a) % mod : (2 * binmult(a, b / 2, mod)) % mod) : 0; }
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
const ll R=1e4;
const ll tx[4]={1,0,-1,0};
const ll ty[4]={0,1,0,-1};
const char rev_to[4]={'E','W','N','S'};
const char o[4]={'S','P','R'};
const int N=3e6+1;
const int M=1e9+7;
//typedef tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update> st;
void bad(){
cout<<-1;
exit(0);
}
string mx[N];
vector<int>p(N,-1);
vector<int>g[N];
pii lol[N];
pii a[N];
ll to[N];
int n;
bool used[N];
string c;
string maxx(string a,string b){
// string c;
if(sz(b)>sz(a)) return b;
else if(sz(b)<sz(a)) return a;
else{
for(int i=0;i<sz(b);i++){
if(b[i]>a[i]){
return b;
}
else if(b[i]<a[i]) return a;
}
return b;
}
}
void dfs(int v){
if(!sz(g[v])){
return ;
}
for(auto &z : g[v]){
dfs(z);
}
string mxx=maxx(mx[g[v][0]],mx[g[v][1]]);
mx[v]=mxx+'0';
//debug()<<imie(mx[v])<<' '<<imie(v);
}
signed main()
{
fast_io;
///TODO :
cin>>n;
// int a,b;
bool ok=1;
for(int i=0;i<n;i++){
cin>>a[i].f>>a[i].s;
if(a[i].f>0){
// p[3*(a[i].f-1)]=3*i;
g[3*i].p_b(3*(a[i].f-1));
}
else{
ok=0;
g[3*i].p_b(3*i+1);
for(int j=32;j>=0;j--){
if(pw(j) & (-a[i].f)){
ok=1;
mx[3*i+1]+='1';
}
else{
if(ok) mx[3*i+1]+='0';
}
}
// reverse(all(mx[3*i+1]));
// debu
}
if(a[i].s>0){
g[3*i].p_b(3*(a[i].s-1));
}
else{
ok=0;
g[3*i].p_b(3*i+2);
for(int j=32;j>=0;j--){
if(pw(j) & (-a[i].s)){
ok=1;
mx[3*i+2]+='1';
}
else{
if(ok) mx[3*i+2]+='0';
}
}
// reverse(all(mx[3*i+2]));
}
}
dfs(0);
// reverse(all(mx[0]));
cout<<mx[0];
return 0;
}
/*
*/
