Define your decision variables. In this case, the decision variables will be the weights of each of the stocks in the portfolio (TCS, BHEL, RI, DBL, APL). Set up the objective function. The objective function will be to maximize the number of quarters in which the portfolio did not lose money. You can do this by using the COUNTIF function to count the number of quarters in which the portfolio return is greater than or equal to 0. Set up the constraints. There are several constraints that you will need to consider: The sum of the weights of the stocks must be equal to 1