#include 
#include 
#include 
#include 
using namespace std;
const int maxn = 200;
typedef long long ll;
int graph[maxn][maxn];
int n;
ll gcd(ll a, ll b) {
    if(a < b) {
        swap(a, b);
    }
    while(b > 0) {
        ll tmp = a;
        a = b;
        b = tmp % b;
    }
    return a;
}
bool check_perfect_square(ll a, ll b) {
    ll c = (a * a) + (b * b);
    ll sq = sqrt(c);
    if(sq * sq == c) {
        return true;
    }
    return false;
}
bool visited[maxn];
int match[maxn];
bool dfs(int node) {
    for(int i = 0; i < maxn; i++) {
        if(graph[node][i] and !visited[i]) {
            visited[i] = true;
            if(match[i] == -1 or dfs(match[i])) {
                match[i] = node;
                return true;
            }
        }
    }
    return false;
}
int maximum_bipartite_matching() {
    memset(match, -1, sizeof match);
    int result = 0;
    for(int i = 0; i < maxn; i++) {
        memset(visited, false, sizeof visited);
        if(dfs(i)) {
            result++;
        }
    }
    return result;
}
int main() {
    cin >> n;
    vector v(n);
    for(int i = 0; i < n; i++) {
        cin >> v[i];
    }
    
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < n; j++) {
            if(gcd(v[i], v[j]) == 1 and check_perfect_square(v[i], v[j])) {
                graph[i][j] = 1;
            }
        }
    }
    cout << maximum_bipartite_matching() << endl;
    return 0;
}