process.stdin.resume();
process.stdin.setEncoding('utf8');
 
function hitungNomorBit(angka, nomorBit) {
  if (nomorBit !== 0 && nomorBit !== 1) {
    return null;
  }
 
  if (angka === 0) {
    return nomorBit === 0 ? 1 : 0;
  }
 
  let jumlah = 0;
  let sisa = angka;
 
  while (sisa > 0) {
    const digit = sisa % 2;
    if (digit === nomorBit) {
      jumlah++;
    }
    sisa = (sisa - digit) / 2;
  }
 
  return jumlah;
}
 
console.log(hitungNomorBit(13, 0));
console.log(hitungNomorBit(13, 1));
console.log(hitungNomorBit(13, 2));
 

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