#!/usr/bin/env python3
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from math import gcd

# %%
N, L, H, *C = map(int, read().split())

# %%


def lcm(x, y):
    return x * (y // gcd(x, y))


def f(H):
    LCM = [1]
    for x in C:
        LCM += [lcm(x, y) for y in LCM]
    A = [H // x for x in LCM]
    for i in range(N):
        for n in range(1 << N):
            if n & (1 << i):
                continue
            A[n] -= A[n ^ (1 << i)]
    return sum(A[1 << i] for i in range(N))


# %%
answer = f(H) - f(L - 1)
print(answer)