import math

n = int(input())
a = list(map(int, input().split()))
x = min(a)
k = a.count(x)

sum_lcm = 0
for num in a:
    if num != x:
        g = math.gcd(x, num)
        sum_lcm += x * num // g

total = sum_lcm + x * (k - 1)
print(total)