import sys
import math

def main():
    n = int(sys.stdin.readline())
    a = list(map(int, sys.stdin.readline().split()))
    m = min(a)
    k = a.count(m)
    sum_lcm = 0
    for num in a:
        if num != m:
            g = math.gcd(m, num)
            sum_lcm += (m * num) // g
    sum_lcm += m * (k - 1)
    print(sum_lcm)

if __name__ == "__main__":
    main()