class Sum{
    int n;
    float f(){
        float sum=0;
        for(int i=1;i<=n;i++)
           sum=sum+i;
        return sum;
    }
}
class Average extends Sum{
    int n;
    float  f(){
        float c;
        super.n=n;
        c=super.f();
        return c/n;
    }
    float g(){
        float c;
        c=super.f();
        return c/2;
    }
}
public class E57{
    public static void main(String args []){
        Average aver=new Average();
        aver.n=100;
        float resultOne=aver.f();
        float resultTwo=aver.g();
        System.out.println("resultOne="+resultOne);
        System.out.println("resultTwo="+resultTwo);
    }
}