static long calculateAnswer ( long L , long R ) {
  powersPrecomputation ( ) ;
  long perfectSquares = ( long ) ( Math . floor ( Math . sqrt ( R ) ) - Math . floor ( Math . sqrt ( L - 1 ) ) ) ;
  long high = Collections . binarySearch ( powers , R ) ;
  long low = Collections . binarySearch ( powers , L ) ;
  long perfectPowers = perfectSquares + ( high - low ) ;
  long ans = ( R - L + 1 ) - perfectPowers ;
  return ans ;
}

static long calculateAnswer ( long L , long R ) { powersPrecomputation ( ) ; long perfectSquares = ( long ) ( Math . floor ( Math . sqrt ( R ) ) - Math . floor ( Math . sqrt ( L - 1 ) ) ) ; long high = Collections . binarySearch ( powers , R ) ; long low = Collections . binarySearch ( powers , L ) ; long perfectPowers = perfectSquares + ( high - low ) ; long ans = ( R - L + 1 ) - perfectPowers ; return ans ; }
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