How do I calculate the subtotal?

public int generateTotal(int total) {

            int subtotal=0;
            subtotal = subtotal + total;
            string dtotal = subtotal.ToString();
            lblTotal.Text = dtotal;
            return total;
        }
        public int geti1(int i){
            int j = 0;
            int tot = j + i;
            generateTotal(tot);
            return tot;
        }
        public int geti2(int i)
        {
            int j = 0;
            int tot = j + i;
            generateTotal(tot);
            return tot;
        }
        public int geti3(int i)
        {
            int j = 0;
            int tot = j + i;
            generateTotal(tot);
            return tot;
        }
        public int geti4(int i)
        {
            int j = 0;
            int tot = j + i;
            generateTotal(tot);
            return tot;
        }
        public int geti5(int i)
        {
            int j = 0;
            int tot = j + i;
            generateTotal(tot);
            return tot;
        }