#include<stdio.h>
#include<stdlib.h>
typedef struct bintree
{
       int data;
       struct bintree *lchild;
       struct bintree *rchild;
}tnode;
int creattree(tnode* &t)
{            int ch;
             scanf("%d",&ch);
             if(ch=='0') t=NULL;
             else
             {   if(!(t=(tnode*)malloc(sizeof(tnode))))
               return 0;
                 t->data=ch;
                 creattree(t->lchild);
                 creattree(t->rchild);
             }
}
int main()
{
    tnode * bt;
    creattree(bt);
    printf("%d",bt->data);
    system("pause");
}