#include <stdio.h>
int main() {
    int n = 0;
    int count = 0;
    scanf("%d", &n);
    while (1) {
        count++;
        if (n % 2 == 0) {
            n = n / 2;
        } else
            n = n * 3 + 1;
        if (n == 1) {
            break;
        }
    }
    printf("%d", count);
    return 0;
}