Please help me with the questions below:

1. You wish to implement the Markowitz optimization for a portfolio containing 36 risky assets. To do so, you will need to estimate 3 different types of inputs. How many estimates of the expected return do you need to implement the optimization?

2. You wish to implement the Markowitz optimization for a portfolio containing 35 risky assets. To do so, you will need to estimate 3 different types of inputs. How many estimates of the variance do you need to implement the optimization?

3. You wish to implement the Markowitz optimization for a portfolio containing 36 risky assets. To do so, you will need to estimate 3 different types of inputs. How many unique values of the covariance do you need to implement the optimization?