package main

import "fmt"

func main() {
	var n int
	_, _ = fmt.Scan(&n)

	// n以下のコインを洗い出す
	coins := make([]int, 0)
	for i := 1; i < n; i++ {
		c := i * (i + 1) / 2
		if c <= n {
			coins = append(coins, c)
		} else {
			break
		}
	}

	// fmt.Println(coins)

	// 幅優先探索してみる
	pattern := []int{0}
	ans := 0
	for ans < 10 {
		ans++
		tmp := make([]int, 0)
		for _, p := range pattern {
			for _, c := range coins {
				if p+c == n {
					fmt.Println(ans)
					return
				} else if p+c < n {
					tmp = append(tmp, p+c)
				}
			}
		}
		pattern = tmp
		// fmt.Println(ans, pattern)
	}
}