import sys
input = sys.stdin.readline

N = int(input())
A = list(map(int, input().split()))
s = sum(A)
c = [0]*(2*10**5+1)

for Ai in A:
    c[Ai] += 1

acc = [0]

for i in range(2*10**5+1):
    acc.append(acc[-1]+c[i])

ans = 0

for i in range(1, 2*10**5+1):
    add = s
    j = 0
    
    while i*j<=2*10**5:
        add -= (acc[min(2*10**5+1, i*(j+1))]-acc[i*j])*i*j
        j += 1
    
    ans += add*c[i]

print(ans)