let input = require('fs').readFileSync('/dev/stdin', 'utf8')
let [W, D] = input.split('\n').map(v => Number(v));
const work = () => W / (D ** 2) | 0;
for (let i = -D; i < D; i++) {
  let tmp = work();
  W -= tmp;
  D--;
  if (i == D - 1) console.log(tmp);
}