import sys
import math

def main():
    input = sys.stdin.read().split()
    n = int(input[0])
    a = list(map(int, input[1:n+1]))
    min_a = min(a)
    sum_total = 0
    for num in a:
        d = math.gcd(num, min_a)
        sum_total += (num * min_a) // d
    sum_total -= min_a
    print(sum_total)

if __name__ == "__main__":
    main()