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import java.util.*;
public class Z341 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a,i,diff=1;

        System.out.print("Podaj wartosc naturalna: ");
        a = in.nextInt();

        System.out.print("Ciag arytmetyczny o roznicy 3: "+diff);
        for(i=0; i<=a; i++){
            diff+=3;
            System.out.print(", "+diff);
        }
        System.out.print(".");
    }
}