import sys
input = lambda : sys.stdin.readline().rstrip()

sys.setrecursionlimit(2*10**5+10)
write = lambda x: sys.stdout.write(x+"\n")
debug = lambda x: sys.stderr.write(x+"\n")
writef = lambda x: print("{:.12f}".format(x))


n,l,h = list(map(int, input().split()))
c = list(map(int, input().split()))
from math import gcd
ans = 0
for b in range(1<<n):
    s = -1
    size = 0
    v = 1
    for i in range(n):
        if b>>i&1:
            s *= -1
            v = v*c[i]//gcd(v,c[i])
            size += 1
    ans += s * size * (h//v - (l-1)//v)
print(ans)