#include <iostream>
using namespace std;

template<typename integer>
integer collatz(integer n) {
    while (1) {
        if (n==1) return 1;
        if (n%2==0) n /= 2;
        else n = 3*n + 1;
    }
}

int main() {
    cout << collatz(-1) << endl;
    return 0;
}