import sys
def main():
    input = sys.stdin.readline
    N,M=map(int, input().split())
    V=map(int, input().split())
    R=map(int, input().split())
    A,B=map(int, input().split())

    dV=[0]*(1000*100+1)
    dV[0]=1
    for v in V:
        for i in range(1000*100+1,-1,-1):
            if i+v>1000*100: continue
            dV[i+v]+=dV[i]
    dR=[0]*(1000*100+1)
    dR[0]=1
    for r in R:
        for i in range(1000*100+1,-1,-1):
            if i+r>1000*100: continue
            dR[i+r]+=dR[i]
    for i in range(1,1000*100+1):
        dV[i]+=dV[i-1]
    ans=Mint()
    for i in range(1,1000*100+1):
        r=dR[i]
        if r>0:
            a=min(1000*100,i*A)
            b=min(1000*100,i*B)
            ans+=r*(dV[b]-dV[a-1])
    print(ans)

MOD = 10**9+7
class Mint:
    def __init__(self, value=0):
        self.value = value % MOD
        if self.value < 0: self.value += MOD

    @staticmethod
    def get_value(x): return x.value if isinstance(x, Mint) else x

    def inverse(self):
        a, b = self.value, MOD
        u, v = 1, 0
        while b:
            t = a // b
            b, a = a - t * b, b
            v, u = u - t * v, v
        if u < 0: u += MOD
        return u

    def __repr__(self): return str(self.value)
    def __eq__(self, other): return self.value == other.value
    def __neg__(self): return Mint(-self.value)
    def __hash__(self): return hash(self.value)
    def __bool__(self): return self.value != 0

    def __iadd__(self, other):
        self.value = (self.value + Mint.get_value(other)) % MOD
        return self
    def __add__(self, other):
        new_obj = Mint(self.value)
        new_obj += other
        return new_obj
    __radd__ = __add__

    def __isub__(self, other):
        self.value = (self.value - Mint.get_value(other)) % MOD
        if self.value < 0: self.value += MOD
        return self
    def __sub__(self, other):
        new_obj = Mint(self.value)
        new_obj -= other
        return new_obj
    def __rsub__(self, other):
        new_obj = Mint(Mint.get_value(other))
        new_obj -= self
        return new_obj

    def __imul__(self, other):
        self.value = self.value * Mint.get_value(other) % MOD
        return self
    def __mul__(self, other):
        new_obj = Mint(self.value)
        new_obj *= other
        return new_obj
    __rmul__ = __mul__

    def __ifloordiv__(self, other):
        other = other if isinstance(other, Mint) else Mint(other)
        self *= other.inverse()
        return self
    def __floordiv__(self, other):
        new_obj = Mint(self.value)
        new_obj //= other
        return new_obj
    def __rfloordiv__(self, other):
        new_obj = Mint(Mint.get_value(other))
        new_obj //= self
        return new_obj

if __name__ == '__main__':
    main()