A bakery makes a variety of cookies. The probability of choosing a chocolate chip cookie is $$\frac{3}{10}$$, the probability of choosing an oatmeal raisin cookie is $$\frac{1}{5}$$, and the probability of choosing a peanut butter cookie is $$\frac{1}{4}$$. What is the probability of choosing a cookie that is either a chocolate chip or an oatmeal raisin cookie?