n = int(input())
a = list(map(int, input().split()))
MX = 2 * 10 ** 5
c = [0] * (MX + 1)
for ai in a:
    c[ai] += 1
s = [0] * (MX + 1)
cs = [0] * (MX + 1)
for i in range(1, MX + 1):
    s[i] = s[i-1] + c[i] * i
    cs[i] = cs[i-1] + c[i]
ans = 0
for d in range(1, MX + 1):
    t = 0
    for i in range(0, MX + 1, d):
        j = min(MX + 1, i + d)
        t += s[j - 1] - s[i] - (cs[j - 1] - cs[i]) * i
    ans += t * c[d]
print(ans)