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A - 质数筛 题目: Bamboo Pole-vault is a massively popular sport in Xzhiland. And Master Phi-shoe is a very popular coach for his success. He needs some bam 阅读全文
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题目: A new e-mail service "Berlandesk" is going to be opened in Berland in the near future. The site administration wants to launch their project as so 阅读全文
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One industrial factory is reforming working plan. The director suggested to set a mythical detail production norm. If at the beginning of the day ther 阅读全文
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Drazil is playing a math game with Varda. Let's define for positive integer x as a product of factorials of its digits. For example, . First, they cho 阅读全文
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A telephone number is a sequence of exactly 11 digits, where the first digit is 8. For example, the sequence 80011223388 is a telephone number, but th 阅读全文
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You are playing the following game with Joisino. Initially, you have a blank sheet of paper. Joisino announces a number. If that number is written on 阅读全文