public static void main ( String [ ] args ) {
  FastScanner fs = new FastScanner ( ) ;
  int n = fs . nextInt ( ) ;
  int x = fs . nextInt ( ) ;
  int y = fs . nextInt ( ) ;
  int rem = y % x ;
  int ans = 0 ;
  String s = fs . next ( ) ;
  int i = 0 ;
  while ( i < n && i < x ) {
    if ( i < rem && s . charAt ( n - i - 1 ) != '0' ) ans ++ ;
    else if ( i == rem && s . charAt ( n - i - 1 ) != '1' ) ans ++ ;
    else if ( i > rem && s . charAt ( n - i - 1 ) != '0' ) ans ++ ;
    i ++ ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { FastScanner fs = new FastScanner ( ) ; int n = fs . nextInt ( ) ; int x = fs . nextInt ( ) ; int y = fs . nextInt ( ) ; int rem = y % x ; int ans = 0 ; String s = fs . next ( ) ; int i = 0 ; while ( i < n && i < x ) { if ( i < rem && s . charAt ( n - i - 1 ) != '0' ) ans ++ ; else if ( i == rem && s . charAt ( n - i - 1 ) != '1' ) ans ++ ; else if ( i > rem && s . charAt ( n - i - 1 ) != '0' ) ans ++ ; i ++ ; } System . out . println ( ans ) ; }
(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)))) (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: (binary_expression left: (identifier) right: (identifier)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (type_identifier) 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: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (identifier) right: (identifier)))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal)))) right: (character_literal)))) consequence: (expression_statement (update_expression (identifier))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal)))) right: (character_literal)))) consequence: (expression_statement (update_expression (identifier))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal)))) right: (character_literal)))) consequence: (expression_statement (update_expression (identifier)))))) (expression_statement (update_expression (identifier))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))