import java.util.Scanner;publicclassP5723{publicstaticvoidmain(String[] args){
Scanner sc =newScanner(System.in);int n = sc.nextInt();int sum =0;int count =0;for(int j =2;; j++){if(f(j)==true){
sum += j;if(sum > n){break;}else{
count++;
System.out.println(j);}}}
System.out.print(count);}publicstaticbooleanf(int x){if(x <2)returnfalse;if(x ==2)returntrue;if(x %2==0)returnfalse;for(int i =3; i * i <= x; i +=2){if(x % i ==0)returnfalse;}returntrue;}}