from math import radians,cos,sin,tan,ceil,floor,log,factorial,gcd,pi
lcm = lambda x,y:x*y//gcd(x,y)
N,L,H = map(int,input().split())
C = list(map(int,input().split()))
ans = 0
for bit in range(1,1<<N):
    ret = 1
    popcnt = 0
    for i in range(N):
        if (bit>>i)&1:
            ret = lcm(ret,C[i])
            popcnt += 1
    if popcnt%2 == 1:
        ans += (H//ret - (L - 1)//ret) * popcnt
    else:
        ans -= (H//ret - (L - 1)//ret) * popcnt
print(ans)