#include <stdio.h>

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

主要就是利用while循环加上if else判断