STASS

def check_sec(main1, main2, add1, add2):
    return int(main1 / main2 == add1 / add2 or main1 / main2 == add2 / add1)


def check(arr):
    a, b, c, d = arr
    ans = 0
    if a + b < c + d and a + b + c > d and a + b + d > c:  # a + b is BC
        ans = max(check_sec(c, d, a, b), ans)
        print(check_sec(c, d, a, b))
        print("Here 1", check_sec(c, d, a, b))
    elif a + b > c + d and a + c + d > b and b + c + d > a:  # c + d is BC
        ans = max(check_sec(a, b, c, d), ans)
        print("Here 2", check_sec(a, b, c, d))

    if a + c < b + d and a + c + b > d and a + c + d > b:  # a + c is BC
        ans = max(check_sec(b, d, a, c), ans)
        print("Here 3", check_sec(b, d, a, c))
    elif a + c > b + d and a + b + d > c and b + d + c > a:  # b + d is BC
        ans = max(check_sec(a, c, b, d), ans)
        print("Here 4", check_sec(a, c, b, d))

    if a + d < b + c and a + d + b > c and a + d + c > b:  # a + d is BC
        ans = max(check_sec(b, c, a, d), ans)
        print("Here 5", check_sec(b, c, a, d))
    elif a + d > b + c and a + b + c > d and d + b + c > a:  # b + c is BC
        ans = max(check_sec(a, d, b, c), ans)
        print("Here 6", check_sec(a, d, b, c))

    return ans


a = []
for i in range(4):
    b = int(input())
    # print(b)
    a.append(b)

print(check(a))