import math
n, l, h = map(int, input().split())
l -= 1
c = list(map(int, input().split()))
ret = 0
m = 1 << n
for i in range(1, m):
    cnt = bin(i).count("1")
    g = 1
    for j in range(n):
        if (i >> j) & 1:
            g = int(g * c[j] / math.gcd(g, c[j]))
    add = (int(h / g) - int(l / g)) * cnt * (-1)**(cnt & 1 ^ 1)
    ret += add
print(ret)