public static void main ( String [ ] args ) throws IOException {
  BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  StringTokenizer stt = new StringTokenizer ( br . readLine ( ) ) ;
  int n = Integer . parseInt ( stt . nextToken ( ) ) ;
  int k = Integer . parseInt ( stt . nextToken ( ) ) ;
  int [ ] arr = new int [ n ] ;
  stt = new StringTokenizer ( br . readLine ( ) ) ;
  int min = Integer . MAX_VALUE ;
  int index = 1 ;
  for ( int i = 0 ;
  i < n ;
  ++ i ) {
    arr [ i ] = Integer . parseInt ( stt . nextToken ( ) ) + ( i == 0 ? 0 : arr [ i - 1 ] ) ;
    if ( i >= k - 1 ) {
      if ( i == k - 1 ) {
        min = arr [ i ] ;
        index = 1 ;
      }
      else {
        int can = arr [ i ] - arr [ i - k ] ;
        if ( can < min ) {
          min = can ;
          index = i - k + 2 ;
        }
      }
    }
  };
}

public static void main ( String [ ] args ) throws IOException { BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; StringTokenizer stt = new StringTokenizer ( br . readLine ( ) ) ; int n = Integer . parseInt ( stt . nextToken ( ) ) ; int k = Integer . parseInt ( stt . nextToken ( ) ) ; int [ ] arr = new int [ n ] ; stt = new StringTokenizer ( br . readLine ( ) ) ; int min = Integer . MAX_VALUE ; int index = 1 ; for ( int i = 0 ; i < n ; ++ i ) { arr [ i ] = Integer . parseInt ( stt . nextToken ( ) ) + ( i == 0 ? 0 : arr [ i - 1 ] ) ; if ( i >= k - 1 ) { if ( i == k - 1 ) { min = arr [ i ] ; index = 1 ; } else { int can = arr [ i ] - arr [ i - k ] ; if ( can < min ) { min = can ; index = i - k + 2 ; } } } } ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) (throws (type_identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (object_creation_expression type: (type_identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (field_access object: (identifier) field: (identifier)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) right: (parenthesized_expression (ternary_expression condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) consequence: (decimal_integer_literal) alternative: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal)))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal)))) alternative: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (identifier)))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))))))))))))))