import sys,random,bisect
from collections import deque,defaultdict,Counter
from heapq import heapify,heappop,heappush
from itertools import cycle, permutations
from math import log,gcd

input = lambda :sys.stdin.readline().rstrip()
mi = lambda :map(int,input().split())
li = lambda :list(mi())

class BIT():
    def __init__(self,n,mod=0):
        self.BIT = [0]*(n+1)
        self.num = n
        self.mod = mod

    """
    return A[1] + A[2] + ... A[idx] in O(log n)
    """
    def query(self,idx):
        res_sum = 0
        mod = self.mod
        while idx > 0:
            res_sum += self.BIT[idx]
            if mod:
                res_sum %= mod
            idx -= idx&(-idx)
        return res_sum

    """
    A[idx] += in O(log n)
    """
    def update(self,idx,x):
        mod = self.mod
        while idx <= self.num:
            self.BIT[idx] += x
            if mod:
                self.BIT[idx] %= mod
            idx += idx&(-idx)
        return

N = int(input())
A = li()

A.sort()

res = 0

fw = BIT(2*10**5)

for i in range(N)[::-1]:
    res += A[i] * (N-2*i-1)
    for k in range(A[i],2*10**5,A[i]):
        res += (N-i-1 - fw.query(k-1)) * A[i]
    fw.update(A[i],1)

print(res)