class triangle
    {
        int base;
        int height;
    } 
    class main
    {
        public static void main(String args[]) 
        {        
             box obj = new triangle();
             obj.base = 10;
             obj.height = 2;
             int y = 1/2(obj.base * obj.height); 
             System.out.print(y);
        } 
    }