f=open("hashuri.in",'r')
g=open("hashuri.out",'w')
n=int(f.readline())
l=list()
for i in range(n):
    line=f.readline().split()
    a=int(line[0])
    b = int(line[1])
    if a==1:
        if b not in l:
            l.append(b)
    elif a==2:
        if b in l:
            c=l.index(b)
            l.pop(c)
    else:
        if b in l:
            g.write('1'+'\n')
        else:
            g.write('0'+'\n')

f.close()
g.close()