mod = 10 ** 9 + 7
U = 2 * 10 ** 6


class Combination:
    """
    SIZEが10**6程度以下の二項係数を何回も呼び出したいときに使う
    使い方:
    comb = Combination(SIZE, MOD)
    comb(10, 3) => 120
    """

    def __init__(self, N, MOD=10 ** 9 + 7):
        self.MOD = MOD
        self.__make_factorial_list(N)

    def __call__(self, n, k):
        if k < 0 or k > n:
            return 0
        res = self.fact[n] * self.inv[k] % self.MOD
        res = res * self.inv[n - k] % self.MOD
        return res

    def nPk(self, n, k):
        if k < 0 or k > n:
            return 0
        return self.fact[n] * self.inv[n - k] % self.MOD

    def nHk(self, n, k):
        if k == 0:
            return 1
        return self.__call__(n + k - 1, k)

    def __make_factorial_list(self, N):
        self.fact = [1] * (N + 1)
        self.inv = [1] * (N + 1)
        MOD = self.MOD
        for i in range(1, N + 1):
            self.fact[i] = (self.fact[i - 1] * i) % MOD
        self.inv[N] = pow(self.fact[N], MOD - 2, MOD)
        for i in range(N, 0, -1):
            self.inv[i - 1] = (self.inv[i] * i) % MOD
        return


def main():
    A, B, X, Y = map(int, input().split())
    if (X + Y + A) % 2 == 1 or A < abs(X) + abs(Y):
        return 0

    tmp = [B // 4] * 4
    for i in range(B % 4):
        tmp[i] += 1
    move = [1, 0, 0, 0]
    for i in range(4):
        move[(i + 1) % 4] += tmp[i]

    comb = Combination(U + 5, mod)
    ans = 0

    absX = abs(X)
    absY = abs(Y)
    for i in range(absX, A + 1, 2):
        j = A - i
        if j < absY:
            break

        tmp = 1
        ok = (i + absX) // 2
        ng = (i - absX) // 2
        if X < 0:
            ok, ng = ng, ok
        tmp = tmp * comb(ok + move[0] - 1, ok) % mod
        if ng:
            tmp = tmp * comb(ng + move[2] - 1, ng) % mod

        ok = (j + absY) // 2
        ng = (j - absY) // 2
        if Y < 0:
            ok, ng = ng, ok
        tmp = tmp * comb(ok + move[1] - 1, ok) % mod
        if ng:
            tmp = tmp * comb(ng + move[3] - 1, ng) % mod

        ans = (ans + tmp) % mod

    return ans


print(main())