import sys
import math

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

if __name__ == "__main__":
    main()