public static void main ( String [ ] args ) {
  Scanner input = new Scanner ( System . in ) ;
  PrintWriter pw = new PrintWriter ( System . out ) ;
  long n ;
  int q ;
  n = input . nextLong ( ) ;
  q = input . nextInt ( ) ;
  long x , y , res ;
  for ( int i = 0 ;
  i < q ;
  i ++ ) {
    x = input . nextInt ( ) ;
    y = input . nextInt ( ) ;
    long k = ( ( x - 1 ) * n + y + 1 ) / 2 ;
    long z = ( n * n + 1 ) / 2 ;
    if ( ( x + y ) % 2 != 0 ) {
      k += z ;
    }
    pw . println ( k ) ;
  }
  pw . flush ( ) ;
}

public static void main ( String [ ] args ) { Scanner input = new Scanner ( System . in ) ; PrintWriter pw = new PrintWriter ( System . out ) ; long n ; int q ; n = input . nextLong ( ) ; q = input . nextInt ( ) ; long x , y , res ; for ( int i = 0 ; i < q ; i ++ ) { x = input . nextInt ( ) ; y = input . nextInt ( ) ; long k = ( ( x - 1 ) * n + y + 1 ) / 2 ; long z = ( n * n + 1 ) / 2 ; if ( ( x + y ) % 2 != 0 ) { k += z ; } pw . println ( k ) ; } pw . flush ( ) ; }
(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: (type_identifier) declarator: (variable_declarator name: (identifier) value: (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 (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier)) declarator: (variable_declarator name: (identifier)) declarator: (variable_declarator name: (identifier))) (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: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (identifier)) right: (identifier)) right: (decimal_integer_literal))) right: (decimal_integer_literal)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))) right: (decimal_integer_literal)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (identifier))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))