import sys

int1 = lambda x: int(x) - 1

# input = lambda: sys.stdin.buffer.readline()
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
i1 = lambda: int1(input())
mi = lambda: map(int, input().split())
mi1 = lambda: map(int1, input().split())
li = lambda: list(mi())
li1 = lambda: list(mi1())
lli = lambda n: [li() for _ in range(n)]

INF = float("inf")
mod = int(1e9 + 7)
# mod = 998244353

n = ii()
a = li()
m = 400010
b = [0] * m
d = [0] * m
for x in a:
    b[x] += x
    d[x] += 1
for i in range(1, m):
    b[i] += b[i - 1]
    d[i] += d[i - 1]
ans = 0
for x in a:
    ans += x * (d[-1] - d[x])
    for y in range(x * 2, m, x):
        ans -= (b[y - 1] - b[y - x]) - (y - x) * (d[y - 1] - d[y - x])
print(ans)