class Dog {

Dog(int m){

}

Dog(double m){

}

int Dog(int m){

return 23;

}

void Dog(double m){

}

}

public interface Com {

    int M = 200;

    int f(); //【1】

}

class People implements Com {

    public int f() //【2】

    {

        return 100 + M;

    }

}

class E {

    public static void main(String args[]) {

        People p = new People();

        Com com = p; //【3】

        com = 100; //【4】

    }

}