You are about to leave on vacation and realize you forgot to pack socks. You race back to your room but the lights are off and you can't see the color of the socks in the drawer. The socks are all mixed up but you know that you have 10 pair of white socks, 10 pair of black socks, and 11 pair of blue socks. How many individual socks do you need to pull out of the drawer to be sure you have at least 1 matching pair?