import sys
import math

def main():
    n = int(sys.stdin.readline())
    A = list(map(int, sys.stdin.readline().split()))
    x = min(A)
    k = A.count(x)
    total = 0
    for a in A:
        g = math.gcd(x, a)
        lcm = x * a // g
        total += lcm
    if k > 1:
        total -= x * (k - 1)
    else:
        total -= x
    print(total)

if __name__ == "__main__":
    main()