public static void main ( String [ ] args ) throws IOException {
  PrintWriter out = new PrintWriter ( System . out ) ;
  FastScanner fs = new FastScanner ( ) ;
  int N , M ;
  N = fs . nextInt ( ) ;
  M = fs . nextInt ( ) ;
  int ans = N ;
  while ( N >= M && N != 1 ) {
    ans += ( N / M ) ;
    N = ( N / M ) + ( N % M ) ;
  }
  out . println ( ans ) ;
  out . close ( ) ;
}

public static void main ( String [ ] args ) throws IOException { PrintWriter out = new PrintWriter ( System . out ) ; FastScanner fs = new FastScanner ( ) ; int N , M ; N = fs . nextInt ( ) ; M = fs . nextInt ( ) ; int ans = N ; while ( N >= M && N != 1 ) { ans += ( N / M ) ; N = ( N / M ) + ( N % M ) ; } out . println ( ans ) ; out . close ( ) ; }
(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 (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)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier)) 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) value: (identifier))) (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) body: (block (expression_statement (assignment_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (parenthesized_expression (binary_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)))))