Matching pair

Jon is about to leave for holiday, but he forgot socks!

he races back to his room, but the power is off so he can't see sock colors.

Never mind, because he remembers that in his drawer there are ten pairs of green socks, ten pairs of black socks, and eleven pairs of blue socks, but they are all mixed up.

How many of his socks does he need to take before he can be sure to have at least one matching pair?

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