import sys
from collections import Counter

input = sys.stdin.buffer.readline

N = int(input())
A = Counter(map(int, input().split()))
MAX = max(A)
A_freq = [0] * (MAX + 1)
for k, v in A.items():
    A_freq[k] += v
A_freq_acc = [0] * (MAX + 1)
for i in range(1, MAX + 1):
    A_freq_acc[i] = A_freq_acc[i - 1] + A_freq[i]


def div_sum(a):
    res = 0
    for i, x in enumerate(range(a - 1, MAX, a), 1):
        res += i * (A_freq_acc[min(x + a, MAX)] - A_freq_acc[x])
    return res


ans = 0
for k, v in A.items():
    ans += k * v * (N - div_sum(k))
print(ans)