def acum(List):#累積和
    rev = [0 for _ in range(len(List))]
    for i in range(len(List)):
        if i == 0:
            rev[i] = List[i]
        else:
           rev[i] = rev[i-1] + List[i] 
    return rev
N = int(input())
A = [0] + list(map(int,input().split()))
A.sort()
mx = max(A)
cnt = [0] * (mx+1)
cum = [0] * (mx+1)
for i in range(len(A)):
    cnt[A[i]] +=1
    cum[A[i]] += A[i]
cnt = acum(cnt)
cum = acum(cum)
DEL = 0
for i in range(1,N+1):
    m = mx//A[i]
    tmp = 0
    for k in range(1,m+1):
        tmp += cum[min((k+1) * A[i]-1,mx)] - cum[k*A[i]-1] - (cnt[min((k+1) * A[i]-1 ,mx)] - cnt[k*A[i]-1]) * A[i] *k
    DEL +=tmp
ans = 0
for i in range(1,N+1)    :
    ans += (N-i) * A[i]
ans -= DEL
print(ans)