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Store all of the jerseys in an array and a boolean array of whether or not each jersey has been taken. Then, for each athlete, if the jersey with their desired number is available and large enough, mark the jersey as taken and add one to the number of assigned jerseys. Note that it is correct to assign the jersey to the first athlete who requests it - no athlete can ever have more than one choice, and no athlete has priority; thus, giving the jersey to any of the athletes that requests it works, and thus giving it to the first one works.
For this problem, check out the [DMOJ Python Tips page](https://dmoj.ca/tips/#python-main) for tips on optimizing input speed; the last test case will TLE if using conventional `input()`.