n = int(input())
MX = 2 * 10 ** 5 + 1
d = [0] * MX
for a in map(int, input().split()):
    d[a] = 1
s = [0] * (MX + 1)
for i in range(MX):
    s[i+1] = s[i] + d[i]
ans = 0
for i in range(MX):
    if not d[i]:
        continue
    ans += i * (s[MX] - s[i + 1] - s[i])
    c = 1
    while i * c < MX:
        ans += i * c * (s[min(i * (c + 1), MX)] - s[i + 1 if c == 1 else i * c])
        c += 1
print(ans)