Misha is given a number . You are required to help Misha determine the summation of the pairwise product of its divisors.
Input format
Output format
Print the answer for each test case in a separate line.
Constraints
Sample Case 1: 4 has three divisors - . Pairwise summation of divisors will be
Sample Case 2: 5 has three divisors - . Pairwise summation of divisors will be