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


length = 2 * 10 ** 5 + 10
imos = [0] * length
vals = [0] * length
for i in range(n):
    vals[a[i]] += 1

for diff in range(1, length):
    cnt = vals[diff]
    for i in range(0, length, diff):
        if i + 1 < length:
            imos[i + 1] += 1 * cnt
        if i + diff < length:
            imos[i + diff] -= 1 * cnt


for i in range(length - 1):
    imos[i + 1] += imos[i]

for diff in range(1, length):
    cnt = vals[diff]
    for i in range(0, length, diff):
        if i + diff < length:
            imos[i + diff] -= (diff - 1) * cnt

for i in range(length - 1):
    imos[i + 1] += imos[i]

ans = 0
for i in range(length):
    ans += imos[i] * vals[i]
print(ans)