\begin{array}{c} \color{#db1616}{\texttt{#Khoadang09}} \end{array}

`@`$\texttt{C++, dùng xâu: }$

#include <bits/stdc++.h>
#define ll long long
#define buff ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define name "TCP"
#define ip freopen(name".INP","r",stdin);
#define op freopen(name".OUT","w",stdout)
using namespace std;
bool check_square(ll n){
    ll sqrn = sqrt(n);
    return n == sqrn * sqrn;
}
ll reverse_string(ll n){
    string s = to_string(n);
    reverse(s.begin(),s.end());
    int result = stoi(s);
    return result;
}

int main(){
    ip; op; buff;
    ll n; cin >> n;
    ll cnt = 0;
    while (n--){
        ll tmp; cin >> tmp ;
        if (check_square(reverse_string(tmp))) cnt ++;
    }
    cout << cnt;
    return 0;
}

#include <bits/stdc++.h>
using namespace std;

long long rev (long long n){
    long long s = 0;
    while (n)
    {
        s = s * 10 + (n % 10);
        n /= 10;
    }
    return s;
}
bool cp (long long n)
{
    long long k = sqrt(n);
    return k * k == n;
}
bool check (long long n)
{
    return cp(rev(n));
}
long long tt, d = 0;
int main() {
    cin >> tt;
    while (tt--)
    {
        long long n;
        cin >> n;
        if (check(n)) d++;
    }
    cout << d;
    return 0;
}