#!/usr/bin/env python3
# from typing import *

import sys
import io
import math
import collections
import decimal
import itertools
import bisect
import heapq


def input():
    return sys.stdin.readline()[:-1]


# sys.setrecursionlimit(1000000)

# _INPUT = """2 1 10
# 2 3
# """
# sys.stdin = io.StringIO(_INPUT)

def get_lcm(a, b):
    return a * b // math.gcd(a, b)

N, L, H = map(int, input().split())
C = list(map(int, input().split()))
ans = 0
for s in range(1, 2**N):
    d = 1
    m = 0
    for i in range(N):
        if s & (1<<i):
            d = get_lcm(d, C[i])
            m += 1
    n = H//d - (L-1)//d
    if m % 2 == 1:
        ans += m*n
    else:
        ans -= m*n
print(ans)