bool isEqual(ld a, ld b) {
    return abs(a - b) < 1e-8;
}

bool isFullSqr(ld x) {
    ld sx = round(sqrt(x));
    return isEqual(sx * sx, x);
}

void solve()
{
    ll n;
    cin>>n;
    ld l = n, r = n;
    ld ans;
    while(true) {
        if (isFullSqr(l)) {
            ans = l;
            break;
        }
        ld sl = floor(sqrt((long double)l));
        ld sr = floor(sqrt((long double)r));
        if (!isEqual(sl, sr)) {
            ans = (sl+1) * (sl+1);
            break;
        }
        l = l * 10;
        r = r * 10 + 9;
    }
    cout.precision(0);
    cout<<fixed<<ans<<endl;

}