package main

import (
	"fmt"
)

func main() {
	solve()
}

func solve(){
	var N, x uint64
	fmt.Scan(&N)
	x = 1
	count := 0
	for {
		x = x+popcount(x)
		count += 1
		if x >= N{
			break
		}
		if count > 100000000{
			break
		}
	}
	if x == N{
		fmt.Println(count+1)
	}else{
		fmt.Println("-1")
	}
}

func popcount(x uint64) uint64 {
	x = (x & 0x5555555555555555) + ((x & 0xAAAAAAAAAAAAAAAA) >> 1)
	x = (x & 0x3333333333333333) + ((x & 0xCCCCCCCCCCCCCCCC) >> 2)
	x = (x & 0x0F0F0F0F0F0F0F0F) + ((x & 0xF0F0F0F0F0F0F0F0) >> 4)
	x = (x & 0x00ff00ff00ff00ff) + ((x & 0xff00ff00ff00ff00) >> 8)
	x = (x & 0x0000ffff0000ffff) + ((x & 0xffff0000ffff0000) >> 16)
	x = (x & 0x00000000ffffffff) + ((x & 0xffffffff00000000) >> 32)
	return x
}