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 j in range(n):
    val = 0
    for b in range(1<<n):
        if b>>j&1:
            continue
        s = 1
        v = 1
        for i in range(n):
            if i==j:
                continue
            if b>>i&1:
                s *= -1
                v = v*c[i]//gcd(v,c[i])
        v = v*c[j]//gcd(v,c[j])
        val += s * (h//v - (l-1)//v)
    ans += val
print(ans)