#include<fstream>
using namespace std; 
ifstream in("hashuri.in"); 
ofstream out("hashuri.out");
long n;
double long a[1000000]; 
int main ()
{ 
	int op,f,q,i,j,aux,m=1; 
	in>>n; 
   for(j=1;j<=n;j++)	
	{   
    in>>op>>f; 	
     q=0; 	  
	 if(op==1) 
       { a[m]=f; 
	         m++; 
	   } 
      if(op==2) 
	   { for(i=1;i<=m;i++) 
		    if(f==a[i])
			 {  aux=a[m]; 
               a[m]=a[i] ; 
                a[i]=aux; 
			 } 
			i=m+1; 
          m--; 
	   } 
		if(op==3) 
		{ for(i=1;i<=m;i++) 
            if(f==a[i]) 
                q=1; 
          out<<q<<endl; 
		} 
   } 
}