public class myVariables
{
    public static void main(String args[])
    {
        System.out.println("Hi there!");

        int a = 1;
        int b = 2;
        int c = a + b;
        System.out.println(c);

        int d = 5;
        int e = 2;
        int f = d - e;
        System.out.println(f);

    }
}