let i = require('fs').readFileSync('/dev/stdin', 'utf8').split('\n').slice(0, -1).map((e) => e-0)
f = (w, d) => {
  let r = Math.floor(w/d/d)
  if (d == 1) return r
  return f(w-r, d-1)
}
console.log(f(i[0], i[1]))