static int firstDigit ( int n ) {
  int fact = 1 ;
  for ( int i = 2 ;
  i <= n ;
  i ++ ) {
    fact = fact * i ;
    while ( fact % 10 == 0 ) fact = fact / 10 ;
  }
  while ( fact >= 10 ) fact = fact / 10 ;
  return fact ;
}

static int firstDigit ( int n ) { int fact = 1 ; for ( int i = 2 ; i <= n ; i ++ ) { fact = fact * i ; while ( fact % 10 == 0 ) fact = fact / 10 ; } while ( fact >= 10 ) fact = fact / 10 ; return fact ; }
(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: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier)))) (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) body: (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))))))) (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) body: (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))))) (return_statement (identifier))))