import math
n = int(input())
a = [int(i) for i in input().split()]

idx = n//2
a1 = a[:idx]
a2 = a[idx:]

mxa = max(a)

li1 = [0]*(mxa+1)
li1[0] = 1
li2 = [0]*(mxa+1)
li2[0] = 1

idx2 = n-idx
exit()

for i in range(2**idx):
    tmp = format(i, '0'+str(idx)+'b')
    if tmp.count("1") == 0:
        continue
    for j in range(idx):
        if tmp[j] == "1":
            gd = a1[j]
            break
    for j in range(idx):
        if tmp[j] == "1":
            gd = math.gcd(gd,a1[j])
    li1[gd] += 1

for i in range(2**idx2):
    tmp = format(i, '0'+str(idx2)+'b')
    if tmp.count("1") == 0:
        continue
    for j in range(idx2):
        if tmp[j] == "1":
            gd = a2[j]
            break
    for j in range(idx2):
        if tmp[j] == "1":
            gd = math.gcd(gd,a2[j])
    li2[gd] += 1

cnt2 = 2**idx2-1
ans = 0
ans += li2[1]
#print(ans)
ans += li1[1]*(cnt2+1)

#print(ans)

for i in range(2,mxa+1):
    tmp = i
    ct = 0
    while tmp <= mxa:
        ct += li2[tmp]
        tmp += i
    ans += li1[i]*(cnt2-ct)

print(ans)