import math

n = int(input())
A = list(map(int, input().split()))
m = min(A)
k = A.count(m)
total = 0
for x in A:
    if x == m:
        continue
    g = math.gcd(m, x)
    total += (m * x) // g
total += (k - 1) * m
print(total)