import sys
from itertools import accumulate
def I(): return int(sys.stdin.readline().rstrip())
def LI(): return list(map(int,sys.stdin.readline().rstrip().split()))


N = I()
A = LI()
count = [0]*(2*10**5+1)
for a in A:
    count[a] += 1
s_count = list(accumulate(count))

ans = N*sum(A)
for i in range(1,2*10**5+1):
    if count[i] == 0:
        continue
    a = 0
    for j in range(2*i-1,2*10**5+1,i):
        a += j//i*(s_count[j]-s_count[j-i])
    ans -= a*count[i]*i

print(ans)