class Combination:
    def __init__(self, n, MOD):
        self.f = [1]
        for i in range(1, n + 1):
            self.f.append(self.f[-1] * i % MOD)
        self.inv_f = [0] * (n + 1)
        self.inv_f[n] = pow(self.f[n], MOD - 2, MOD)
        for i in reversed(range(n)):
            self.inv_f[i] = self.inv_f[i + 1] * (i + 1) % MOD
        self.MOD = MOD

    def inv(self, k):
        """get inverse(k)"""
        return (self.inv_f[k] * self.f[k - 1]) % self.MOD

    def fact(self, k):
        """get k!"""
        return self.f[k]

    def inv_fact(self, k):
        """get inverse(k!)"""
        return self.inv_f[k]

    def perm(self, k, r):
        """get kPr"""
        if k < r:
            return 0
        return (self.f[k] * self.inv_f[k - r]) % self.MOD

    def comb(self, k, r):
        """get kCr"""
        if k < r:
            return 0
        return (self.f[k] * self.inv_f[k - r] % self.MOD
                * self.inv_f[r]) % self.MOD


def way4(ball, box):
    """ball: False / box: True / constraints: None
    -> ans = comb(box + ball - 1, ball)
    """
    if box == 0 and ball == 0:
        return 1
    if box == 0:
        return 0
    if ball == 0:
        return 1
    return comb.comb(ball + box - 1, ball)

    # 区別するbox個の箱 -> 区別しない(box - 1)個の仕切に変換して解く



a, b, x, y = map(int, input().split())
MOD = 10 ** 9 + 7
comb = Combination(3 * 10 ** 6, MOD)


def answer(a, b, x, y):
    def solve(xp_cnt, xm_cnt, yp_cnt, ym_cnt):
        res = 1
        res = res * way4(xp_cnt, xp) % MOD
        res = res * way4(xm_cnt, xm) % MOD
        res = res * way4(yp_cnt, yp) % MOD
        res = res * way4(ym_cnt, ym) % MOD
        return res

    bucket = [1, 0, 0, 0]
    for i in range(b):
        i += 1
        bucket[i % 4] += 1
    xp, yp, xm, ym = bucket

    ans = 0
    for i in range(a + 1):
        cntx = i
        cnty = a - i

        xp_cnt = (cntx + x)
        xm_cnt = (cntx - x)
        yp_cnt = (cnty + y)
        ym_cnt = (cnty - y)

        if xp_cnt % 2 == 1 or xp_cnt < 0:
            continue
        if xm_cnt % 2 == 1 or xm_cnt < 0:
            continue
        if yp_cnt % 2 == 1 or xp_cnt < 0:
            continue
        if ym_cnt % 2 == 1 or ym_cnt < 0:
            continue

        xp_cnt //= 2
        xm_cnt //= 2
        yp_cnt //= 2
        ym_cnt //= 2

        ans += solve(xp_cnt, xm_cnt, yp_cnt, ym_cnt)
        ans %= MOD

    return ans


print(answer(a, b, x, y) % MOD)