static int findSmallestX ( int Y ) {
  int low = 0 , high = 5 * Y ;
  int N = 0 ;
  while ( low <= high ) {
    int mid = ( high + low ) / 2 ;
    if ( countFactor ( 5 , mid ) < Y ) {
      low = mid + 1 ;
    }
    else {
      N = mid ;
      high = mid - 1 ;
    }
  }
  return N ;
}

static int findSmallestX ( int Y ) { int low = 0 , high = 5 * Y ; int N = 0 ; while ( low <= high ) { int mid = ( high + low ) / 2 ; if ( countFactor ( 5 , mid ) < Y ) { low = mid + 1 ; } else { N = mid ; high = mid - 1 ; } } return N ; }
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