def main1(n,a):
  ret=n*sum(a)
  m=max(a)
  ary=[0]*(m+1)
  for x in a:ary[x]+=1
  sary=[0]
  for x in ary:sary.append(sary[-1]+x)
  for x in a:
    i=1
    while i*x<=m:
      # xで割った商がiになる数字の個数
      # [i*x,(i+1)*x)
      s=i*x
      e=min((i+1)*x,m+1)
      t=sary[e]-sary[s]
      ret-=i*x*t
      i+=1
  return ret
if __name__=='__main__':
  n=int(input())
  a=list(map(int,input().split()))
  print(main1(n,a))