#include<bits/stdc++.h>
using namespace std;
int sushu(int n)
{
	int cnt = 0;
	for(int i=2;i<=sqrt(n);i++)
	{
		if(n%i==0)
		{
			cnt++;
			break;
		}
	}
	if(cnt==0)return 1;
	else return 0;
}
int main()
{
	for(int i=1000;i<=3000;i++)
	{
		int k1=i%1000;
		int k2=i%100;
		int k3=i%10;
		if(sushu(i)==1&&sushu(k1)==1&&sushu(k2)==1&&sushu(k3)==1)
		{
			cout<<i<<endl;
		}
	}
	return 0;
}
/**************************************************************
	Problem: 1137
	User: wangyuxin
	Language: C++
	Result: Wrong Answer
****************************************************************/