import sys
import math

def main():
    input = sys.stdin.read().split()
    n = int(input[0])
    A = list(map(int, input[1:n+1]))
    
    if n == 1:
        print(0)
        return
    
    # Find m1, count_m1, m2, count_m2
    m1 = float('inf')
    m2 = float('inf')
    count_m1 = 0
    count_m2 = 0
    
    for a in A:
        if a < m1:
            m2 = m1
            count_m2 = count_m1
            m1 = a
            count_m1 = 1
        elif a == m1:
            count_m1 += 1
        elif a < m2:
            m2 = a
            count_m2 = 1
        elif a == m2:
            count_m2 += 1
    
    if count_m1 >= 2:
        # Case 1: multiple m1, connect all to m1
        sum_lcm = 0
        for a in A:
            g = math.gcd(m1, a)
            sum_lcm += (m1 * a) // g
        sum_result = sum_lcm - m1
        print(sum_result)
    else:
        # Case 2: connect m1 to m2, then others to m1 or m2
        g = math.gcd(m1, m2)
        lcm_m1m2 = (m1 * m2) // g
        sum_total = lcm_m1m2 + (count_m2 - 1) * m2
        
        for a in A:
            if a == m1 or a == m2:
                continue
            g1 = math.gcd(m1, a)
            lcm1 = (m1 * a) // g1
            g2 = math.gcd(m2, a)
            lcm2 = (m2 * a) // g2
            sum_total += min(lcm1, lcm2)
        
        print(sum_total)

if __name__ == '__main__':
    main()