using System;
class Class1 {
	static uint MAX = Convert.ToUInt32(Math.Pow(2, 20));
	static int max3Plus1 = (int)MAX * 3 + 1;
	static int[] cache = new int[max3Plus1];

	static void Main() {
		long start = DateTime.Now.Ticks;
		int maxStep = 0;
		uint maxN = 0;
		for(uint n = 1; n <= MAX; n++) {
			int step = collatz(n);
			if(maxStep < step) {
				maxStep = step;
				maxN = n;
			}
		}
		Console.WriteLine("f(" + maxN + ")=" + maxStep);
		Console.WriteLine((DateTime.Now.Ticks - start) / 10000L + "ms");
		Console.ReadLine();
	}

	static int collatz(uint n) {
		int step = 0;
		uint z = n;
		while(z != 1) {
			if(z - 1 <= max3Plus1 && cache[z - 1] != 0) {
				step += cache[z - 1];
				break;
			} else {
				if(z % 2 == 0) z /= 2;
				else z = z * 3 + 1;
				step++;
			}
		}
		cache[n - 1] = step;
		return step;
	}
}