import math

n = int(input())
a = list(map(int, input().split()))
m = min(a)

sum_lcm = 0
for num in a:
    gcd_val = math.gcd(m, num)
    sum_lcm += m * num // gcd_val

# Subtract m because the center node is counted once in the sum
sum_lcm -= m
print(sum_lcm)