public class Fib {
	public static long fib(long n) {
		if (n == 0) return 0;
		if (n == 1) return 1;
		return fib(n-1) + fib(n-2);
	}

	public static void main(String[] args) {
		long a = 0;
		long r = 0;

		a = Long.parseUnsignedLong(args[0]);
		r = fib(a);
		System.out.println("fib("+ Long.toUnsignedString(a) + ") = " + r);
	}
}