public static void main ( String args [ ] ) {
  MyScanner sc = new MyScanner ( ) ;
  long n = sc . nextLong ( ) , a = sc . nextLong ( ) , b = sc . nextLong ( ) ;
  long min = b + a * ( n - 1 ) ;
  long max = a + b * ( n - 1 ) ;
  if ( max < min ) {
    System . out . println ( 0 ) ;
  }
  else {
    System . out . println ( max - min + 1 ) ;
  }
}

public static void main ( String args [ ] ) { MyScanner sc = new MyScanner ( ) ; long n = sc . nextLong ( ) , a = sc . nextLong ( ) , b = sc . nextLong ( ) ; long min = b + a * ( n - 1 ) ; long max = a + b * ( n - 1 ) ; if ( max < min ) { System . out . println ( 0 ) ; } else { System . out . println ( max - min + 1 ) ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier) dimensions: (dimensions))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_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))) 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)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (decimal_integer_literal))))) alternative: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal)))))))))