public class Calculator {
	private int num1;
	private int num2;
	private int result;
	
	public Calculator(int x, int y)
	{
		num1 = x;
		num2 = y;
	}
	
	public int addOne(int DigitArray)
	{
		String stringNum1 = Integer.toString(DigitArray);
		String[] arrNum1 = stringNum1.split("");
		int[] newArrNum1 = new int[arrNum1.length];
		   for (int i = 0; i < arrNum1.length; i++) {
		      newArrNum1[i] = Integer.parseInt(arrNum1[i]);
		   }
		int lastDigit = newArrNum1[newArrNum1.length-1];
		switch(lastDigit)
		{
		case 0:
			lastDigit = 1;
			System.out.println(lastDigit);
			return lastDigit;
		case 1:
			lastDigit = 2;
			System.out.println(lastDigit);
			return lastDigit;
		case 2:
			lastDigit = 3;
			System.out.println(lastDigit);
			return lastDigit;
		case 3:
			lastDigit = 4;
			System.out.println(lastDigit);
			return lastDigit;
		case 4:
			lastDigit = 5;
			System.out.println(lastDigit);
			return lastDigit;
		case 5:
			lastDigit = 6;
			System.out.println(lastDigit);
			return lastDigit;
		case 6:
			lastDigit = 7;
			System.out.println(lastDigit);
			return lastDigit;
		case 7:
			lastDigit = 8;
			System.out.println(lastDigit);
			return lastDigit;
		case 8:
			lastDigit = 9;
			System.out.println(lastDigit);
			return lastDigit;
		case 9:
			lastDigit = 0;
			updateNumberPlus(lastDigit, arrNum1, newArrNum1);
			System.out.println(lastDigit);
			return lastDigit;
		default:
			return lastDigit;
		}
	}
	public int add()
	{
		int i = 0;
		while(i <= num2)
		{
			i++;
			this.addOne(num1);
			if(i == num2)
			{
				result = 0;
				System.out.print(result);
				return result;
			}
		}
		return result;
	}
	
	public void updateNumberPlus(int lastDigit, String[] arrNum1, int[] newArrNum1)
	{
        int[] newNum1 = newArrNum1.clone();
		int b = newArrNum1.length;
		while(b > 0)
		{ 
			if(newArrNum1[b] == newNum1[b] && newNum1[b] == 0)
			{
				addOne(newNum1[b]);
			}
		}
	}
    }