import ast

def sums(set_):
    if len(set_) > 0:
        for sum_ in sums(set_[1:]):
            yield sum_
            yield set_[0] + sum_
    else:
        yield 0

def cond(set_):
    it = sums(set_)
    next(it)
    for sum_ in it:
        if sum_ == 0:
            return True
    return False

line = input()
while line != "":
    print(cond(ast.literal_eval(line)))
    line = input()