/**
 * calculate fibonacci number 23
 */
print(fib(23) as str);
halt;

/**
 * Recursively calculate fibonacci
 */
function fib(nat n) nat {
  if (n < 2) { return n; }
  return fib(n - 2) + fib(n - 1);
}

function print(str string) {
    nat i = 0;
    while (i < string.length) {
        write = string[i];
        i = i + 1;
    }
    write = '\n';
}