https://atcoder.jp/contests/abc132/tasks/abc132_f We have \[ k \le \left\lfloor \frac{N}{i} \right\rfloor \iff i * k \le N \iff i \le \left\lfloor \frac{N}{k} \right\rfloor. \]\[ \underbrace{\left\lfloor \frac{N}{1} \right\rfloor, \left\lf…