#include <bits/stdc++.h>
int fa[10000000 + 10];
long long gcd(long long a, long long b) { return (a == 0) ? b : gcd(b % a, a); }
int getfa(int a) {
  if (fa[a] == a) return a;
  return fa[a] = getfa(fa[a]);
}
int m(long long a, long long b) {
  if (a > 10000000 || b > 10000000 || fa[a] == 0 || fa[b] == 0) return 0;
  int faa = getfa(a), fbb = getfa(b);
  if (faa == fbb) return 0;
  fa[faa] = fbb;
  return 1;
}
int main() {
  int n;
  scanf("%d", &n);
  for (int i = 0; i < n; i++) {
    int tmp;
    scanf("%d", &tmp);
    fa[tmp] = tmp;
  }
  int ans = n;
  for (long long i = 1; i * i <= 10000000 / 2; i++) {
    for (long long j = i + 1;; j++) {
      long long a = 2 * i * j;
      long long b = j * j - i * i;
      if (a > 10000000 || b > 10000000) break;
      if (gcd(a, b) > 1) continue;
      long long c = j * j + i * i;
      if (gcd(a * b, c) > 1) continue;
      ans -= m(a, b) + m(b, c) + m(c, a);
    }
  }
  printf("%d\n", ans);
}
