#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
int main()
{
	int k,i,j,sum=0,flag=1,ans=0,a=0;
	cin>>k;
	if(k==1){cout<<a<<endl;return 0;}
	for(i=2;i<100000;i++)
	{
		flag=1;
		for(j=2;j<=sqrt(i);j++)
		{
			if(i%j==0){flag=0;break;}
		}
		if(flag==1){ans+=i;if(ans<=k){cout<<i<<endl;cout<<" "<<endl;a++;}}
		if(ans>k)break;
	}
	cout<<a<<endl;
	return 0;
 }