#include<bits/stdc++.h>
using namespace std;
bool s (int i){
	bool r=true;
	if(i<2){
		r=false;
	}
	for(int n=2;n<=sqrt(i);n++){
		if(i%n==0){
			r=false;
		}
	}
	return r;
}
bool h(int i){
	bool r=true;
	int g=i%10;
	int s=i/10%10;
	int b=i/100;
	if(g*100+s*10+b!=i) r=false;
	return r;
}
int main(){
	cout<<"11"<<endl;
	for(int i=10;i<=999;i++){
		if(s(i)&&h(i))cout<<i<<endl;
	} 
	return 0;
}
/**************************************************************
	Problem: 1142
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:4 ms
	Memory:2072 kb
****************************************************************/