class Bit:
    def __init__(self, n):
        self.size = n
        self.tree = [0] * (n + 1)

    def sum(self, i):
        i += 1
        s = 0
        while i > 0:
            s += self.tree[i]
            i -= i & -i
        return s

    def sumrange(self, i, j):
        si = self.sum(i - 1)
        sj = self.sum(j)
        return sj - si

    def add(self, i, x):
        i += 1
        while i <= self.size:
            self.tree[i] += x
            i += i & -i

    def lower_bound(self, w):
        if w <= 0:
            return 0
        x = 0
        r = 1 << (self.size).bit_length()
        while r > 0:
            if x+r < self.size and self.tree[x+r] < w:
                w -= self.tree[x+r]
                x += r
            r = r >> 1
        return x


N = int(input())
A = list(map(int, input().split()))
A.sort(reverse=True)
M = int(A[0]**0.5)
bit = Bit(A[0]+2)

ans = 0
for i, a in enumerate(A):
    ans += (2*i-N+1)*a
    if a >= M:
        v = 0
        for j in range(M+2):
            if a*j > A[0]:
                break
            ans += j*bit.sumrange(j*a, min((j+1)*a-1, A[0]))*a
    else:
        for b in A[:i]:
            ans += b//a*a
    bit.add(a, 1)

print(ans)