#define ll long long
#define rep(i,l,r)for(ll i=(l);i<(r);i++)

int isp(ll n){
	for(ll i=2;i*i<=n;i++)if(n%i==0)return 0;
	return 1;
}

ll a[2][50];
maekeisann(){
	a[0][0]=3;
	a[1][0]=2;
	ll cnt=1;
	for(ll c=3;c<1000;c++)if(isp(c+c+1)){
		int f=1;
		rep(i,0,cnt)if(isp(c+  a[  c%2][i]))f=0;
		rep(i,0,cnt)if(isp(c+1+a[1-c%2][i]))f=0;
		if(f){
			a[0][cnt]=c%2?c:c+1;
			a[1][cnt]=c%2?c+1:c;
			cnt++;
		}
	}
}

ll ans[50],len,n;
f(ll k){
	if(k==0)return 0;
	ll temp=sqrt(k);
	k-=temp*temp;
	ans[len++]=temp;
	n+=temp;
	f(k);
}

main(){
	maekeisann();
	ll k;
	scanf("%lld",&k);
	f(k);
	printf("%d\n",n*2);
	rep(i,0,len)rep(j,0,ans[i])printf("%lld %lld ",a[0][i],a[1][i]);
}