#!/usr/bin/env python3


def solve(ds, p0):
    d0 = sum(abs(z) for z in p0)
    ds_set = set(ds)
    res = 0
    for d in ds:
        if abs(d - d0) in ds:
            res = 2
        elif d0 in ds:
            res = 1
    return res


def main():
    n = int(input())
    ds = [int(d) for d in input().split()]
    p0 = tuple(int(z) for z in input().split())
    print(solve(ds, p0))


if __name__ == '__main__':
    main()