mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    # comb init
    # mod = 1000000007
    nmax = 10 ** 6 + 10  # change here
    fac = [0] * nmax
    finv = [0] * nmax
    inv = [0] * nmax
    fac[0] = 1
    fac[1] = 1
    finv[0] = 1
    finv[1] = 1
    inv[1] = 1
    for i in range(2, nmax):
        fac[i] = fac[i - 1] * i % mod
        inv[i] = mod - inv[mod % i] * (mod // i) % mod
        finv[i] = finv[i - 1] * inv[i] % mod

    def comb(n, r):
        if n < r:
            return 0
        else:
            return (fac[n] * ((finv[r] * finv[n - r]) % mod)) % mod

    a, b, x, y = map(int, input().split())
    if (x + y)%2 != a % 2:
        print(0)
        exit()

    if b == 0:
        if a == x and y == 0:
            print(1)
        else:
            print(0)
        exit()
    if b == 1:
        if x < 0 or y < 0:
            print(0)
        elif a != x + y:
            print(0)
        else:
            print(1)
        exit()
    if b == 2:
        if y < 0:
            print(0)
        else:
            aa = a - y
            print(1)

    ans = 0
    Z = (a - abs(x) - abs(y)) // 2
    xp = xn = yp = yn = (b+1) // 4
    if b%4 == 0:
        xp += 1
    elif b%4 == 1:
        xp += 1
        yp += 1
    elif b%4 == 2:
        xp += 1
        yp += 1
        xn += 1
    for zx in range(Z+1):
        zy = Z - zx
        nx = abs(x) + 2 * zx
        ny = abs(y) + 2 * zy
        nxp = (nx + x) // 2
        nxn = nx - nxp
        nyp = (ny + y) // 2
        nyn = ny - nyp
        tmp = 1
        tmp = (tmp * comb(xp + nxp - 1, xp-1))%mod
        tmp = (tmp * comb(xn + nxn - 1, xn - 1)) % mod
        tmp = (tmp * comb(yp + nyp - 1, yp - 1)) % mod
        tmp = (tmp * comb(yn + nyn - 1, yn - 1)) % mod
        ans = (ans + tmp)%mod
    print(ans)


if __name__ == '__main__':
    main()