import sequtils,strutils,math

proc p2(i : int): int=
    1 shl i

var
    N,L,H,i,p,cnt : int
    C,A : seq[int]
(N,L,H) = stdin.readline.split.map(parseInt)
C = stdin.readline.split.map(parseInt)
cnt = 0
for c in C:
    cnt += H div c
    cnt -= (L - 1) div c
for i in 0..p2(N):
    A = @[]
    for k in 0..N - 1:
        if (i and p2(k)) > 0:
            A.add(C[k])
    if A.len > 1:
        p = 1
        block hantei:
            for a in A:
                try:
                    p = p * a div gcd(p, a)
                except:
                    break hantei
            if A.len mod 2 == 0:
                cnt -= (H div p) * A.len
                cnt += ((L- 1) div p) * A.len
            else:
                cnt += (H div p) * A.len
                cnt -= ((L - 1) div p) * A.len
echo cnt