#include<stdio.h>
#include<stdlib.h>
#include<string.h>

typedef struct Node{
	int data;
	struct Node* next;
}Node;

int main(){
	Node* p;
	Node head;
	head.data=-1;
	head.next=NULL;
	p=&head;
	int n;
	scanf("%d",&n);
	for(int i=1;i<=n;i++){
		p->next=(Node*)malloc(sizeof(Node));
		p=p->next;
		p->data=i;
		p->next=NULL;
	}
	p->next=head.next;
	Node* r=p->next;
	int last=-1;
	while(1){
		if(p->next==p) {
			last=p->data;
			break;
		}
		for(int i=0;i<2;i++){
			p=p->next;
		}
		p->next=p->next->next;
	}
	printf("%d",last);
}