import math
from functools import reduce
def lcm_base(x, y):
    return (x * y) // math.gcd(x, y)

def lcm_list(numbers):
    return reduce(lcm_base, numbers, 1)

n, l, h = map(int, input().split())
C = list(map(int, input().split()))

ans = 0
for i in range(1<<n):
    X = []
    for j in range(n):
        if (i>>j)&1:
            X.append(C[j])
    if not X:
        continue
    y = lcm_list(X)
    cnt = h//y-(l-1)//y
    if len(X)%2 == 0:
        ans -= cnt*len(X)
    else:
        ans += cnt*len(X)
print(ans)