from math import gcd
N, L, H = map(int, input().split())
C = tuple(list(map(int, input().split())))


def enum(v):
    return H // v - (L - 1) // v


dp = [0] * N
for S in range(1, 1 << N):
    lcm = 1
    coef = -1
    for i, c in enumerate(C):
        if (S >> i) & 1:
            lcm = lcm // gcd(lcm, c) * c
            coef *= -1

    cnt = enum(lcm)
    for i in range(N):
        if (S >> i) & 1:
            dp[i] += coef * cnt

print(sum(dp))