|Codeforces Beta Round #56|
Misha decided to help Pasha and Akim be friends again. He had a cunning plan — to destroy all the laughy mushrooms. He knows that the laughy mushrooms can easily burst when they laugh. Mushrooms grow on the lawns. There are a[t] mushrooms on the t-th lawn.
Misha knows that the lawns where the mushrooms grow have a unique ability. A lawn (say, i) can transfer laugh to other lawn (say, j) if there exists an integer (say, b) such, that some permutation of numbers a[i], a[j] and b is a beautiful triple ( i ≠ j). A beautiful triple is such three pairwise coprime numbers x, y, z, which satisfy the following condition: x 2 + y 2 = z 2.
Misha wants to know on which minimal number of lawns he should laugh for all the laughy mushrooms to burst.
The first line contains one integer n (1 ≤ n ≤ 106) which is the number of lawns. The next line contains n integers a i which are the number of mushrooms on the i-lawn (1 ≤ a i ≤ 107). All the numbers are different.
Print a single number — the minimal number of lawns on which Misha should laugh for all the mushrooms to burst.