PAT_1001（中文）

#include<stdio.h>

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