Not able to understand what is wrong here

Правка en4, от New_Beginning, 2020-11-19 22:24:36

I don't understand why my code is showing runtime error on test 2. I tried but could not find the problem . Please help. The code. Problem C of educational codeforces round 98. The problem.

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  Rev. Язык Кто Когда Δ Комментарий
en4 Английский New_Beginning 2020-11-19 22:24:36 2
en3 Английский New_Beginning 2020-11-19 22:24:10 13
en2 Английский New_Beginning 2020-11-19 22:23:33 91
en1 Английский New_Beginning 2020-11-19 22:22:20 244 Initial revision (published)