Problem:
Score : 500 points

Problem Statement

Given are N positive integers A_1,...,A_N.

Consider positive integers B_1, ..., B_N that satisfy the following condition.

Condition: For any i, j such that 1 \leq i < j \leq N, A_i B_i = A_j B_j holds.

Find the minimum possible value of B_1 + ... + B_N for such B_1,...,B_N.

Since the answer can be enormous, print the sum modulo (10^9 +7).

Constraints

1 \leq N \leq 10^4

1 \leq A_i \leq 10^6

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
A_1 ... A_N

Output

Print the minimum possible value of B_1 + ... + B_N for B_1,...,B_N that satisfy the condition, modulo (10^9 +7).

Sample Input 1

3
2 3 4

Sample Output 1

13

Let B_1=6, B_2=4, and B_3=3, and the condition will be satisfied.

Sample Input 2

5
12 12 12 12 12

Sample Output 2

5

We can let all B_i be 1.

Sample Input 3

3
1000000 999999 999998

Sample Output 3

996989508

Print the sum modulo (10^9+7).

Solution in Python (3.4.3) (judge verdict: Accepted)

n = int(input())
L = list(map(int,input().split()))
m = 10**9+7
ans = 0
def gcd(x,y):
  while y != 0:
    cur = x
    x = y
    y = cur%y
  return x
if n != 1:
  lcm = L[0]*L[1]//gcd(L[0],L[1])
  for i in range(2,n):
    p = gcd(L[i],lcm)
    lcm = L[i]*lcm//p
  for i in range(n):
    k = (lcm%m)*pow(L[i],10**9+5,m)
    ans = (ans+k)%m
else:
  ans = 1
print(ans)