lab2.7

class Sum
{
	//private static int x;

	public static int sum(int a, int b)
	{
		x = a + b;
		return x;
	}

	//private static int y;

	public static int sum(int a , int b, int c)
	{
		y = x + c;
		return y;
	}

	//private static int z;

	public static int sum(int a, int b, int c, int d)
	{
		z = y + d;
		return z;
	}
}

class MainSum
{
	public static void main(String[] args)
	{
		//Sum S = new Sum();

		System.out.println(S.sum(1,2));
		System.out.println(S.sum(0,2,2));

	}
}