Exercise 1. Find the number of odd integers between 1 and 2019 inclusive.

Only a numerical answer is expected here.
Solution to Exercise 1 The integers sought are the odd integers between 1 and 2020 inclusive. Among the 2020 integers between 1 and 2020, half are even, and the other half are odd. This results in 1010 odd integers, and the expected answer is 1010.