public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  int a = in . nextInt ( ) ;
  int b = in . nextInt ( ) ;
  int w = in . nextInt ( ) ;
  int x = in . nextInt ( ) ;
  long c = in . nextInt ( ) ;
  if ( b >= 0 && b < w && x > 0 && x < w ) if ( c <= a ) System . out . println ( 0 ) ;
  else {
    long sec = ( long ) Math . ceil ( 1.0 * ( ( c - a ) * x - b ) / ( w - x ) ) ;
    System . out . println ( sec + c - a ) ;
  }
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; int a = in . nextInt ( ) ; int b = in . nextInt ( ) ; int w = in . nextInt ( ) ; int x = in . nextInt ( ) ; long c = in . nextInt ( ) ; if ( b >= 0 && b < w && x > 0 && x < w ) if ( c <= a ) System . out . println ( 0 ) ; else { long sec = ( long ) Math . ceil ( 1.0 * ( ( c - a ) * x - b ) / ( w - x ) ) ; System . out . println ( sec + c - a ) ; } }
(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: (integral_type) 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: (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)))) (local_variable_declaration type: (integral_type) 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: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (identifier))) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (binary_expression left: (identifier) right: (identifier)))) consequence: (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (decimal_integer_literal)))) alternative: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (cast_expression type: (integral_type) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (decimal_floating_point_literal) right: (parenthesized_expression (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (identifier)) right: (identifier)))) right: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))))))))) (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: (identifier))))))))))