There's a string of numbers 1, 1, 2, 3, 5, 8, 13, 21, 34, 55 How many of the first 100 numbers are multiples of 5

The rule of this group is to start from the second one, and the difference between the latter number and the former number is the number before the two numbers, that is, 1, 1, 2, 3, 5, 8, 13, respectively
Then, every group of five numbers, the single digit of the fifth number will be 5 or 0, and 20 of the first 100 numbers will be multiples of 5

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