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#include <fstream>
using namespace std;
ifstream cin("hashuri.in");
ofstream cout("hashuri.out");
int n, v[1000001], k, x, p, i;
short t;
int cautbin(int v[], int k, int x)
{
int st=1, dr=k, m;
while(st<=dr)
{
m=st+(dr-st)/2;
if(v[m]==x) return m;
if(v[m]>x) dr=m-1;
else st=m+1;
}
return 0;
}
void unu(int v[], int &k, int x, int p)
{
int i;
for(i=k; p==0; i--)
if(v[i]>x)
{
v[i+1]=v[i];
}
else
{
v[i+1]=x;
p=1;
k++;
}
}
void doi(int v[], int &k, int x, int p)
{
int i;
if(p)
{
for(i=p; i<k; i++)
v[i]=v[i+1];
k--;
}
}
void trei(int v[], int k, int x, int p)
{
if(p==0) cout<<0<<'\n';
else cout<<1<<'\n';
}
int main()
{
cin>>n;
for(i=1; i<=n; i++)
{
cin>>t>>x;
p=cautbin(v, k, x);
if(t==1) unu(v, k, x, p);
else
if(t==2) doi(v, k, x, p);
else trei(v, k, x, p);
}
return 0;
}