public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int k = sc . nextInt ( ) ;
  int n = sc . nextInt ( ) ;
  int s = sc . nextInt ( ) ;
  int p = sc . nextInt ( ) ;
  int r = 0 ;
  if ( n <= s ) {
    if ( k % p == 0 ) {
      r = k / p ;
    }
    else {
      r = ( k / p ) + 1 ;
    }
  }
  else {
    int d = 0 ;
    if ( n % s == 0 ) {
      d = n / s ;
    }
    else {
      d = ( n / s ) + 1 ;
    }
    if ( ( k * d ) % p == 0 ) {
      r = ( k * d ) / p ;
    }
    else {
      r = ( k * d ) / p + 1 ;
    }
  }
  System . out . println ( r ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int k = sc . nextInt ( ) ; int n = sc . nextInt ( ) ; int s = sc . nextInt ( ) ; int p = sc . nextInt ( ) ; int r = 0 ; if ( n <= s ) { if ( k % p == 0 ) { r = k / p ; } else { r = ( k / p ) + 1 ; } } else { int d = 0 ; if ( n % s == 0 ) { d = n / s ; } else { d = ( n / s ) + 1 ; } if ( ( k * d ) % p == 0 ) { r = ( k * d ) / p ; } else { r = ( k * d ) / p + 1 ; } } System . out . println ( r ) ; }
(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: (decimal_integer_literal))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier))))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal))))))) alternative: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier))))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal)))))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (identifier)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (identifier))))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (identifier)) right: (decimal_integer_literal)))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))