class BIT():
    def __init__(self,N):
        self.N = N
        self.bit = [0] * (N + 1)
    
    def sum(self,loc):
        loc -= 1
        res = 0
        while loc:
            res += self.bit[loc]
            loc -= loc & -loc
        return res
            
    def sum_range(self,x,y):
        return self.sum(y) - self.sum(x - 1)

    def add(self, loc, x):
        while loc <= self.N:
            self.bit[loc] += x
            loc += loc & -loc

    def update(self,loc,x):
        while loc <= self.N:
            self.bit[loc] = x
            loc +=loc & -loc
            
    def binary_search(self,x):
        upper = self.N - 1
        lower = 0
        while upper - lower>1:
            mid = ( upper + lower) // 2
            if self.sum(mid) > x - 1:
                upper = mid
            else:
                lower = mid
        return lower + 1

N = int(input())
A = list(map(int, input().split()))

A.sort()
Bit = BIT(3 * 10 ** 5)
ans = 0
large = 0
for i in range(N)[::-1]:
    ans += (N - 1 - i) * A[i]
    ans -= large
    for j in range(A[i],3 * 10 ** 5, A[i]):
        ans += A[i] * ((N - 1 - i) - Bit.sum(j))
    Bit.add(A[i], 1)
    large += A[i]

print(ans)