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/**
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 * @param {number} L
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 * @param {number} R
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 * @return {number}
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 */
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var countPrimeSetBits = function (L, R) {
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  let set = new Set([2, 3, 5, 7, 11, 13, 17, 19]);
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  let countPrime = 0;
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  for (let i = L; i <= R; i++) {
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    if (set.has(i.toString(2).replace(/0/g, "").length)) countPrime++;
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  }
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  return countPrime;
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};