#include <bits/stdc++.h>
#define maxn 1000005
#define pll_i pair<long long,int>
#define broj first
#define ste2 second
using namespace std;
int n;
int l[maxn];
int r[maxn];
pll_i veci(pll_i a,pll_i b)
{
if(a.broj<b.broj)
{
swap(a.broj,b.broj);
swap(a.ste2,b.ste2);
}
int lg2_a=0,lg2_b=0;
long long abr=a.broj;
long long bbr=b.broj;
while(abr>0LL)
{
lg2_a++;
abr/=2;
}
while(bbr>0LL)
{
lg2_b++;
bbr/=2;
}
bbr=b.broj;
int ste2_b=b.ste2;
while(lg2_b<lg2_a)
{
lg2_b++;
bbr*=2;
ste2_b--;
}
if(ste2_b>a.ste2)return b;
if(ste2_b<a.ste2)return a;
if(bbr>a.broj)return b;
return a;
}
pll_i resi(int x)
{
pll_i res1,res2;
if(l[x]>0)res1=resi(l[x]);else res1={-l[x],0};
if(r[x]>0)res2=resi(r[x]);else res2={-r[x],0};
pll_i sol=veci(res1,res2);
sol.ste2++;
//cout<<res1.broj<<","<<res1.ste2<<" "<<res2.broj<<","<<res2.ste2<<" "<<sol.broj<<","<<sol.ste2<<endl;
return sol;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
cin>>n;
for(int i=1;i<=n;i++)
{
cin>>l[i]>>r[i];
}
pll_i sol=resi(1);
//cout<<sol.broj<<" "<<sol.ste2<<endl;
string s;
while(sol.broj>0)
{
s.push_back(sol.broj%2 + '0');
sol.broj/=2;
}
int len=s.size();
for(int i=len-1;i>=0;i--)cout<<s[i];
while(sol.ste2>0)
{
cout<<"0";
sol.ste2--;
}
/*string s;
while(sol>0)
{
s.push_back(sol%2 + '0');
sol/=2;
}
int len=s.size();
for(int i=len-1;i>=0;i--)cout<<s[i];*/
return 0;
}
