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)
    sum_total = 0
    for a in A:
        g = math.gcd(a, m)
        term = (a * m) // g
        sum_total += term
    result = sum_total - m
    print(result)

if __name__ == "__main__":
    main()