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What is the output of this program?

class Overload 
{
    int x;
    int y;
    void add(int a) 
    {
        x =  a + 1;
    }
    void show()
    {
        System.out.println(x);      }        
    }    
    public static void main(String args[])
    {
        Overload obj = new Overload();   
        int a = 0;
        obj.add(6);
        obj.show();
    }
}

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