int main()
{
//#ifdef _DEBUG
freopen("in.txt","r",stdin);
freopen("out.txt","w",stdout);
//#endif
cin >>n;
for(int i=0;i<n;i++)
{
int x=read_int(),y;
switch(x)
{
case 1:
y=read_int();
q.push(y);
break;
case 2:
cout <<q.top()<<endl;
break;
case 3:
q.pop();
break;
}
}
return 0;
}
inline int dijkstra()
{
memset(d,0x7f,sizeof(d));
d[s]=0;
q.push(make_pair(d[s],s));
while(!q.empty())
{
pii u=q.top();q.pop();
int x=u.second;
if(d[x]!=u.first)continue;
if(x==t)break;
for(int i=point[x];i!=-1;i=edges[i].next)
if(d[edges[i].v]>d[x]+edges[i].val){
d[edges[i].v]=d[x]+edges[i].val;
q.push(make_pair(d[edges[i].v],edges[i].v));
}
}
return d[t];
}
