Before you can register, you must answer 3 simple questions. All answers are numbers. If the answer is integer, simply type it in the corresponding field. A fraction must be typed in its simple irreducible form, i.e. 5/2 (neither 2.5, nor 2 1/2).

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A Megamind solved 26 puzzles. For each correct solution he received 8 Megabucks, and for each incorrect solution he paid 5 Megabucks. How many puzzles did he solve correctly if at the end he had zero balance?

How many natural numbers less than 1000 are not divisible by 5 and 7?