zju2830剑术冠军Champion of the Swordsmanship

用时：0ms
#include
int main()
{
     freopen("2830.txt","r",stdin);
     freopen("output.txt","w",stdout);
    int n,d,m,sum;
    while(scanf("%d",&n)!=EOF)
    {
       sum=0;
      if(n==0)
        break;
      while(1)
      {
         if(n==1)
         {
           printf("%d/n",sum);
           break;
         }
         if(n==2)
         {
           printf("%d/n",sum+1);
           break;
         }
         d=n/3;
         m=n%3;
         n=d+m;
         sum=sum+d;
      }
    }
    return 0;
}