public static void main ( String [ ] args ) {
  int n = s . nextInt ( ) , k = s . nextInt ( ) , t [ ] = new int [ n + 1 ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) t [ i + 1 ] = s . nextInt ( ) ;
  Arrays . parallelPrefix ( t , Integer :: sum ) ;
  for ( int i = 3 ;
  i <= n ;
  i ++ ) {
    if ( t [ i ] - t [ i - 3 ] < k ) {
      System . out . println ( i ) ;
      return ;
    }
  }
  System . out . println ( - 1 ) ;
}

public static void main ( String [ ] args ) { int n = s . nextInt ( ) , k = s . nextInt ( ) , t [ ] = new int [ n + 1 ] ; for ( int i = 0 ; i < n ; i ++ ) t [ i + 1 ] = s . nextInt ( ) ; Arrays . parallelPrefix ( t , Integer :: sum ) ; for ( int i = 3 ; i <= n ; i ++ ) { if ( t [ i ] - t [ i - 3 ] < k ) { System . out . println ( i ) ; return ; } } System . out . println ( - 1 ) ; }
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