#include <bits/stdc++.h>
using namespace std;
bool ss(int n){
	bool f=1;
	for(int i=2;i<=sqrt(n);i++){
		if(n%i==0){
			f=0;
			break;
		}
	}
	return f;
}
bool hw(int n){
	int g,s,b;
	g=n%10;
	s=n/10%10;
	b=n/100;
	if(n<=99&&g==s){
		return 1;
	}else if(s*10+g*100+b==n){
		return 1;
	}
	return 0;
}
int main(){
	for(int i=10;i<=1000;i++){
		if(ss(i)&&hw(i)){
			cout<<i<<endl;
		}
	} 
	return 0;
}

/**************************************************************
	Problem: 1142
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:5 ms
	Memory:2072 kb
****************************************************************/