N = int(input())
A = list(map(int, input().split()))
M = 200000
D = [0] * (M + 1)
DS = [0] * (M + 1)
S = [0] * (M + 1)
for a in A:
    D[a] += 1

for i in range(1, M+1):
    S[i] = S[i - 1] + i * D[i]
    DS[i] = DS[i - 1] + D[i]

ans = 0
for i in range(2, M+1):
    if D[i] > 0:
        ans += S[i - 1] * D[i]
        for j in range(1, M // i + 1):
            ans += D[i] * (S[min(i * (j + 1) - 1, M)] - S[i * j] - i * j * (DS[min(i * (j + 1) - 1, M)] - DS[i * j]))

print(ans)