#include<iostream>
#include<algorithm>
#include<cstdio>
#include<vector>
#include<string.h>
using namespace std;
const int Max=111;
int low[Max],dfn[Max];
int cnt[Max];
vector<int>Gra[Max];
int n,m,sons;
int MIN(int a,int b)
{
    return a>b?b:a;
}
void dfs(int pox,int dep)
{
    dfn[pox]=low[pox]=dep;
    for(int i=0; i<Gra[pox].size(); i++)
    {
        int v=Gra[pox][i];
        if(!dfn[v])
        {
            dfs(v,dep+1);
            if(pox==1) sons++;
            else
            {
                low[pox]=MIN(low[pox],low[v]);
                if(low[v]>=dfn[pox])
                    cnt[pox]=1;
            }
        }
        else low[pox]=MIN(low[pox],dfn[v]);
    }
}
int main()
{
    int u,v;
    int ans;
    while(scanf("%d",&n),n)
    {
        sons=ans=0;
        for(int i=1; i<Max; i++)
            Gra[i].clear();
        memset(cnt,0,sizeof(cnt));
        memset(dfn,0,sizeof(dfn));
        memset(low,0,sizeof(low));
        while(scanf("%d",&u),u)
        {
            while(getchar()!='\n')
            {
                scanf("%d",&v);
                Gra[u].push_back(v);
                Gra[v].push_back(u);
            }
        }
        dfs(1,1);
        if(sons>1)
          cnt[1]=1;
        for(int i=1; i<=n; i++)
            ans+=cnt[i];
        printf("%d\n",ans);
    }
    return 0;
}