Can't Understand this Question

Правка en1, от haribhatt34, 2018-08-12 10:35:00

I am having trouble understanding this question. Sorry the pic is not quite clear, it's a snapshot from the PC. This question was asked previous year by a company which came to our college for recruitment.

The input example given are more like the multiple of 5. But I think there is more the question I am missing.

Thanks

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  Rev. Язык Кто Когда Δ Комментарий
en3 Английский haribhatt34 2018-08-12 10:38:26 253
en2 Английский haribhatt34 2018-08-12 10:35:50 0 Pic of the Question
en1 Английский haribhatt34 2018-08-12 10:35:00 359 Initial revision (published)