#include<fstream>
#include<vector>
using namespace std;
#define prim 666013
vector<int>H[prim];

int op3(vector <int> H[prim],int val)
{int rest=val%prim;
 int n=H[rest].size();
for(int i=0;i<n;i++)
  if(H[rest][i]==val)
   return i;
return -1;
}
void op1(vector <int> H[prim],int val)
{int rest=val%prim;
if(op3(H,val)!=-1)return;
H[rest].push_back(val);
}

void op2(vector <int> H[prim],int val)
{int rest=val%prim;
int i=op3(H,val);
if(i==-1)return ;
H[rest][i]=H[rest].back();
H[rest].pop_back();
}
int main()
{int i,n,op,x;
ifstream f("hashuri.in");
ofstream g("hashuri.out");
f>>n;
for(i=1;i<=n;i++)
{f>>op;
f>>x;
if(op==1)
    op1(H,x);
if(op==2)
    op2(H,x);
if(op==3)
    if(op3(H,x)!=-1)
    g<<1<<endl;
else
    g<<0<<endl;
}
f.close();
f.close();
return 0;
}