package main

import "fmt"

func main() {
	var x int
	fmt.Scan(&x)
	if x < 0 {
		x = -x
	}
	sum := 0
	for n := 0; ; n++ {
		sum += n
		if sum >= x && (sum-x)%2 == 0 {
			fmt.Println(n)
			break
		}
	}
}