Сколько чисел от 1 до 100 не делится ни на 5 ни на 7
1,2,3,4,6,8,9,11,12,13,16,17,18,19,22,23,24,26,27,29,31,32,33,34,36,37,38,39,41,43,44,46,47,48,51,52,53,54,57,58,59,61,62,64,66,67,68,69,71,72,73,74,76,78,79,81,82,83,86,87,88,89,92,93,94,96,97,99 не делится на 5 и на 7