#include using namespace std; typedef long long ll; ll calc(ll d) { return (ll)((-1 + sqrt(1 + 4*d)) / 2.0); } int main() { int cnt = 0; for(ll i = 90000000; i >= 80000000; i--){ ll d = i * i + i; //cin >> d; ll t = calc(d); //cout << t << endl; //cout << t*t + t << endl; t++; //cout << t*t + t << endl; if(t*t + t <= d){ // cout << "NG!!" << endl; // cout <