A survey is taken of 101 people who vacationed at a dude ranch. The following information was obtained: 13 took swimming lessons, attended the barn dance, and bought souvenirs. 29 attended the barn dance and bought souvenirs. 27 took swimming lessons and bought souvenirs. 21 took swimming lessons but didn't attend the barn dance. 68 took swimming lessons or bought souvenirs. 1 only bought souvenirs. 28 did none of these things. How many attended the barn dance?

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