//a=abc/100;
//b=abc/10;
//b=b%10;
//c=abc%100;
//c=c%10;

#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: chenzhuo1
	Language: C++
	Result: Accepted
	Time:4 ms
	Memory:2072 kb
****************************************************************/