from math import gcd

n, l, h = map(int, input().split())
C = list(map(int, input().split()))
ans = 0
for bit in range(1, 1 << n):
    x = 1
    cnt = 0
    for i in range(n):
        if bit >> i & 1:
            cnt += 1
            x = x * C[i] // gcd(x, C[i])
    mi = (l + x - 1) // x
    ma = h // x
    if cnt & 1:
        ans += (ma - mi + 1) * cnt
    else:
        ans -= (ma - mi + 1) * cnt
print(ans)