#include using namespace std; using ll = long long; using P = pair; #define fix(x) fixed << setprecision(x) #define asc(x) x, vector, greater #define rep(i, n) for(ll i = 0; i < n; i++) #define all(x) (x).begin(),(x).end() templatebool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;} templatebool chmax(T&a, const T&b){if(a1){ int md = (ok+ng)/2; if(md*md<=x) ok = md; else ng = md; } return ok*ok==x; } int main(){ cin.tie(nullptr); ios::sync_with_stdio(false); int n; cin >> n; for(int i=1;i*i