static int findNumber ( int n ) {
  int x = ( int ) Math . floor ( ( - 1 + Math . sqrt ( 1 + 8 * n - 8 ) ) / 2 ) ;
  int base = ( x * ( x + 1 ) ) / 2 + 1 ;
  return n - base + 1 ;
}

static int findNumber ( int n ) { int x = ( int ) Math . floor ( ( - 1 + Math . sqrt ( 1 + 8 * n - 8 ) ) / 2 ) ; int base = ( x * ( x + 1 ) ) / 2 + 1 ; return n - base + 1 ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (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: (parenthesized_expression (binary_expression left: (unary_expression operand: (decimal_integer_literal)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (decimal_integer_literal) right: (binary_expression left: (decimal_integer_literal) right: (identifier))) right: (decimal_integer_literal)))))) right: (decimal_integer_literal))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))))) right: (decimal_integer_literal)) right: (decimal_integer_literal)))) (return_statement (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal)))))