n = int(input())
a = list(map(int, input().split()))

MAX = 200001
cum = [0 for _ in range(MAX)]
for x in a:
	cum[x] += 1
for i in range(1, MAX):
	cum[i] += cum[i-1]

ans = 0
tot = sum(a)
s = cum[1]
for i in range(2, MAX):
	num = cum[i] - cum[i-1]
	if num == 0:
		continue
	ans += num * s
	tmp = tot - s
	for j in range(i, MAX, i):
		tmp -= i * (j//i) * (cum[min(j+i, MAX)-1] - cum[j-1])
	ans += num * tmp
	s += i * num
print(ans)