#include <stdio.h>

int main() {
    int n = 0;
    int count = 0;
    scanf("%d",&n);
    while (n != 1) {
        if (n % 2 == 0) {
            n = n  / 2;
            count++;
        }
        else {
            n = n * 3 +  1;
            count++;
        }
    }
    printf("%d",count);
    return 0;
}