最幸运的人

import java.util.ArrayList;
import java.util.Scanner;

public class 最幸运的人 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        Scanner scanner = new Scanner(System.in);
        int N=scanner.nextInt();
        ArrayList<Integer> arrayList = new ArrayList<>();
        for(int i=1;i<=N;i++) {
            arrayList.add(i);
        }
        int j=0,k=0;
        while(arrayList.size()!=1) {
            if(++j%3==0) {
                arrayList.remove(k);
                k--;
            }
            if(++k>=arrayList.size()) {
                k=0;
            }
        }
        System.out.println(arrayList.get(0));
    }

}