#include <iostream>
using namespace std;

int main ()
{
    int number;
    for (number = 3; number<=20; number++)
    {

        for (int counter = 2; counter*counter<=number; counter++)
        {
            if( number% counter == 0)
            {
                break;
            }

            else{
                cout<<number<<endl;
            }
        }
    }
    return 0;
}

#include <iostream>
using namespace std;

int main ()
{
    int number;
    for (number = 3; number<=200; number++)
    {
        bool prime = true;
        for (int counter = 2; counter*counter<=number; counter++)
        {
            if( number% counter == 0)
            {
                prime = false;
                break;
            }
        }
        if (prime) cout << number << endl;
    }
    return 0;
}