static boolean isPower ( int n ) {
  for ( int x = 2 ;
  x <= Math . sqrt ( n ) ;
  x ++ ) {
    int p = x ;
    while ( p <= n ) {
      p = p * x ;
      if ( p == n ) return true ;
    }
  }
  return false ;
}

static boolean isPower ( int n ) { for ( int x = 2 ; x <= Math . sqrt ( n ) ; x ++ ) { int p = x ; while ( p <= n ) { p = p * x ; if ( p == n ) return true ; } } return false ; }
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