with open('proc2.in') as f:
    x = int(f.readline())
    operatii = []
    for i in range(x):
        operatii.append(tuple([int(x) for x in f.readline().split()]))

print(operatii)
xs = {}

def hashfunction(x):
    return (x*25-x*(x+40))%666013

def add(x):
    global xs
    val = hashfunction(x)
    if val not in xs:
        xs[val] = x

def remo(x):
    global xs
    val = hashfunction(x)
    if val in xs:
        del xs[val]

def intreb(x):
    global xs
    val = hashfunction(x)
    if val in xs:
        return 1
    return 0

out = []
for i in operatii:
    if i[0] == 1:
        add(i[1])
    elif i[0] == 2:
        remo(i[1])
    else:
        out.append(intreb(i[1]))

with open('proc2.out','w') as g:
    for i in range(len(out)):
        g.write(str(out[i])+'\n')