public void banknotai()
        {
            while (graza >= 500)
            {
                graza = graza - 500;
                banknotaii[0]++;
            }
            while (graza >= 200)
            {
                graza = graza - 200;
                banknotaii[1]++;
            }
            while (graza >= 100)
            {
                graza = graza - 100;
                banknotaii[2]++;
            }
            while (graza >= 50)
            {
                graza = graza - 50;
                banknotaii[3]++;
            }
            while (graza >= 20)
            {
                graza = graza - 20;
                banknotaii[4]++;
            }
            while (graza >= 10)
            {
                graza = graza - 10;
                banknotaii[5]++;
            }
            while (graza >= 5)
            {
                graza = graza - 5;
                banknotaii[6]++;
            }
            while (graza >= 2)
            {
                graza = graza - 2;
                centaii[0]++;
            }
            while (graza >= 1)
            {
                graza = graza - 1;
                centaii[1]++;
            }
            while (graza >= 0.5)
            {
                graza = graza - 0.5;
                centaii[2]++;
            }
            while (graza >= 0.2)
            {
                graza = graza - 0.2;
                centaii[3]++;
            }
            while (graza >= 0.1)
            {
                graza = graza - 0.1;
                centaii[4]++;
            }
            while (graza >= 0.05)
            {
                graza = graza - 0.05;
                centaii[5]++;
            }
            while (graza >= 0.02)
            {
                graza = graza - 0.02;
                centaii[6]++;
            }
            while (graza >= 0.01)
            {
                graza = graza - 0.01;
                centaii[7]++;
            }
            label7.Text = string.Join(", ", banknotaii[0] + " po 500eur, " +
                banknotaii[1] + " po 200eur, " +
                banknotaii[2] + " po 100eur, " +
                banknotaii[3] + " po 50eur, " +
                banknotaii[4] + " po 20eur, " +
                banknotaii[5] + " po 10eur, " +
                banknotaii[6] + " po 5eur "
                );

            label8.Text = string.Join(", ", centaii[0] + " po 2eur, " +
                centaii[1] + " po 1eur, " +
                centaii[2] + " po 50ct, " +
                centaii[3] + " po 20ct, " +
                centaii[4] + " po 10ct, " +
                centaii[5] + " po 5ct, " +
                centaii[6] + " po 2ct, " +
                centaii[7] + " po 1ct "
                );
        }