mod = 1000000007
eps = 10**-9


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

    N, K, x, y = map(int, input().split())
    A = list(map(int, input().split()))
    A = list(set(A))
    K = len(A)

    que = deque()
    for i in range(K):
        que.append([A[i]])
    while len(que[0]) < N:
        B = que.popleft()
        for a in A:
            if a != B[-1]:
                que.append(B[:] + [a])
    ans = 0
    while que:
        B = que.pop()
        z = 0
        for b in B:
            z ^= b
        if x <= z <= y:
            ans += 1
    print(ans)


if __name__ == '__main__':
    main()