#include<bits/stdc++.h>
using namespace std;
bool ss(int n){
    bool f=true;
    for(int i=2;i<=sqrt(n);i++){
        if(n%i==0){
            f=false;
            break;
        }
    }
    return  f;
}
bool hw(int n){
    bool f=true;
    int g,s,b;
    g=n%10;
    s=n/10%10;
    b=n/100;
    if(n<=99&&g==s) f=true;
    else if(g*100+s*10+b!=n) f=false;
    return f;
}
int main(){
    for(int i=10;i<=1000;i++){
        if(ss(i)&&hw(i)) cout<<i<<endl;
    } 
  // cout<<ss(1);
 
    return 0;
}
/**************************************************************
	Problem: 1142
	User: huanghengyi
	Language: C++
	Result: Accepted
	Time:4 ms
	Memory:2072 kb
****************************************************************/