def solve(q, qu):
    s = set()
    X = []
    for v in qu:
        if v[0] == 1:
            s.add(v[1])
        if v[0] == 2:
            s.discard(v[1])
        if v[0] == 3:
            ans = 0
            for v in s:
                ans |= v
            X.append(ans)
    return X

q = int(input())

qu = [list(map(int,input().split())) for _ in range(q)]

for v in solve(q, qu):
    print(v)