import sys
from math import gcd
sys.setrecursionlimit(10**7)
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int,sys.stdin.readline().rstrip().split())
def LI(): return list(map(int,sys.stdin.readline().rstrip().split()))
def LI2(): return list(map(int,sys.stdin.readline().rstrip()))
def S(): return sys.stdin.readline().rstrip()
def LS(): return list(sys.stdin.readline().rstrip().split())
def LS2(): return list(sys.stdin.readline().rstrip())


N,L,H = MI()
C = LI()

ans = 0
for i in range(1,1<<N):
    a = 1
    r = 0
    for j in range(N):
        if (i>>j) & 1:
            c = C[j]
            a = (a*c)//gcd(a,c)
            r += 1
    if r % 2 == 0:
        ans -= r*(H//a-(L-1)//a)
    else:
        ans += r*(H//a-(L-1)//a)

print(ans)