public static void main ( String [ ] $ ) {
  int n = scanner . nextInt ( ) , k = scanner . nextInt ( ) , t [ ] = IntStream . range ( 0 , n ) . map ( i -> scanner . nextInt ( ) ) . toArray ( ) ;
  System . out . println ( IntStream . rangeClosed ( 3 , n ) . filter ( i -> t [ i - 3 ] + t [ i - 2 ] + t [ i - 1 ] < k ) . findFirst ( ) . orElse ( - 1 ) ) ;
}

public static void main ( String [ ] $ ) { int n = scanner . nextInt ( ) , k = scanner . nextInt ( ) , t [ ] = IntStream . range ( 0 , n ) . map ( i -> scanner . nextInt ( ) ) . toArray ( ) ; System . out . println ( IntStream . rangeClosed ( 3 , n ) . filter ( i -> t [ i - 3 ] + t [ i - 2 ] + t [ i - 1 ] < k ) . findFirst ( ) . orElse ( - 1 ) ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (method_invocation object: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (identifier))) name: (identifier) arguments: (argument_list (lambda_expression parameters: (identifier) body: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))) name: (identifier) arguments: (argument_list)))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (method_invocation object: (method_invocation object: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (identifier))) name: (identifier) arguments: (argument_list (lambda_expression parameters: (identifier) body: (binary_expression left: (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (identifier))))) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list (unary_expression operand: (decimal_integer_literal)))))))))