from itertools import combinations
from math import lcm
N, L, H = map(int, input().split())
C = list(map(int, input().split()))


def slv2(C, N, x):
    # N以下のxの倍数で、Cでは割り切れない数の個数
    U = N // x
    any_div = 0
    for i in range(1, len(C) + 1):
        for comb in combinations(C, i):
            l = lcm(*comb, x)
            if i % 2:
                any_div += N // l
            else:
                any_div -= N // l
    return U - any_div


def slv(C, N):
    # N以下でCの元のうちただ1つだけで割り切れる数の個数
    ans = 0
    for i in range(len(C)):
        rem = [c for j, c in enumerate(C) if j != i]
        ans += slv2(rem, N, C[i])
    return ans


print(slv(C, H) - slv(C, L - 1))