using System;
using System.Collections.Generic;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;
using static System.Math;
using System.Numerics;
using System.Threading;
using System.Runtime.CompilerServices;
using System.Diagnostics;
static class Program{
	const int mod=(int)1e9+7;
	static void Main(){
		Sc sc=new Sc();
		var n=sc.L;
		var q=Sqrt(n);
		int m=(int)Log(n,2)+1;
		long ans=n+1;
		if(n>2){ans=n-1;}
		for(int i = 2;i<q;i++) {
			if(n%i==0&&i*((long)i+1)!=n){ans=Min(n/i-1,ans);}
			Nsn nsn=new Nsn(n,i,m);
			var b=0L;
			for(int j = m-1;j>=0;j--) {
				if(b==0&&nsn[j]!=0){b=nsn[j];}
				if(b!=nsn[j]){b=-1;break;}
			}
			if(b!=-1){ans=Min(i,ans);}
		}
		Console.WriteLine("{0}",ans);
	}
}
public struct Nsn{
	public long[] h;
	public long p,q;
	public Nsn(long n,int p,int k){
		this.p=p;
		q=p-1;
		h=new long[k];
		for(int i = 0;n>0;i++) {
			h[i]=n%p;
			n/=p;
		}
	}
	public void Add(){
		for(int i = 0;i<h.Length;i++) {
			if(++h[i]==p){h[i]=0;}
			else{break;}
		}
	}
	public void Sub(){
		for(int i = 0;i<h.Length;i++) {
			if(--h[i]==255){h[i]=q;}
			else{break;}
		}
	}
	public override string ToString()=>string.Join(" ",h.Reverse());
	public long this[int i]{get{return h[i];}}
}
public class Sc{
	public int I{get{return int.Parse(Console.ReadLine());}}
	public long L{get{return long.Parse(Console.ReadLine());}}
	public double D{get{return double.Parse(Console.ReadLine());}}
	public string S{get{return Console.ReadLine();}}
	public int[] Ia{get{return Array.ConvertAll(Console.ReadLine().Split(),int.Parse);}}
	public long[] La{get{return Array.ConvertAll(Console.ReadLine().Split(),long.Parse);}}
	public double[] Da{get{return Array.ConvertAll(Console.ReadLine().Split(),double.Parse);}}
	public string[] Sa{get{return Console.ReadLine().Split();}}
	public object[] Oa{get{return Console.ReadLine().Split();}}
	public int[] Ia2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),int.Parse);}}
	public int[] Ia3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),int.Parse);}
	public int[] Ia3(int a){return Array.ConvertAll((Console.ReadLine()+" "+a.ToString()).Split(),int.Parse);}
	public long[] La2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),long.Parse);}}
	public long[] La3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),long.Parse);}
	public long[] La3(int a){return Array.ConvertAll((Console.ReadLine()+" "+a.ToString()).Split(),long.Parse);}
	public double[] Da2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),double.Parse);}}
	public double[] Da3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),double.Parse);}
	public T[] Arr<T>(int n,Func<T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f();}return a;}
	public T[] Arr<T>(int n,Func<int,T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i);}return a;}
	public T[] Arr<T>(int n,Func<string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(Console.ReadLine().Split());}return a;}
	public T[] Arr<T>(int n,Func<int,string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i,Console.ReadLine().Split());}return a;}
}