import math

n = int(input())
a = list(map(int, input().split()))
m = min(a)
cnt = a.count(m)
sum_lcm = 0
for num in a:
    if num != m:
        g = math.gcd(m, num)
        sum_lcm += (m * num) // g
sum_total = (cnt - 1) * m + sum_lcm
print(sum_total)