from itertools import accumulate
n = int(input())
a = list(map(int, input().split()))
ans = 0
m = max(a)
lis = [0] * (m + 1)
for i in a:
    lis[i] += 1
cum = list(accumulate(lis))
for i in range(1, m + 1):
    if lis[i] == 0:
        continue
    for j in range(i, m + 1, i):
        ans += lis[i] * i * (n - cum[j - 1])
print(sum(a) * n - ans)