import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.NoSuchElementException;
import java.util.Stack;


class XMLNode
{
    XMLNode(String name)
    {
        children = new XMLNode[20];
        parent = null;
        nChildren = 0;
        this.name = name;
        zatvoren = false;
    }

    void addChild(XMLNode node)
    {
        node.parent = this;
        children[nChildren++] = node;
    }

    void print()
    {
        System.out.printf("Node: %s, zatvoren: %s\n", name, zatvoren);
        for (int i = 0; i < nChildren; i++)
            children[i].print();
    }

    boolean zatvoren;
    int nChildren;
    String name;
    XMLNode parent;
    XMLNode children[];
}

public class CheckXML {

    static boolean eZatvoracki(String tag)
    {
        return tag.charAt(1) == '/';
    }

    static String imeTag(String tag)
    {
        if (!eTag(tag))
            return "";
        return (eZatvoracki(tag) ? tag.substring(2, tag.length()-1) : tag.substring(1, tag.length()-1));
    }

    static boolean eTag(String tag)
    {
        return tag.charAt(0) == '[';
    }

    public static void main(String[] args) throws Exception{

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        int n = Integer.parseInt(s);
        String [] redovi = new String[n];

        for(int i=0;i<n;i++)
            redovi[i] = br.readLine();

        int valid = 1;
        Stack<String> stack = new Stack<String>();
        XMLNode rootyRoot = new XMLNode("[]");
        XMLNode root = new XMLNode(imeTag(redovi[0]));
        rootyRoot.addChild(root);
        XMLNode aktiven = root;
        for (int i = 1; i < redovi.length; i++)
        {
            String red = redovi[i];
            if (eTag(red))
            {
                if (!eZatvoracki(red))
                {
                    XMLNode roditel = aktiven;
                    aktiven = new XMLNode(imeTag(red));
                    if (roditel != null)
                        roditel.addChild(aktiven);
                    else
                    {
                        valid = 0;
                        break;
                    }
                }
                else
                {
                    //=System.out.printf("Aktiven: %s se zatvora so %s\n", aktiven.name, imeTag(red));
                    if (aktiven.name.equals(imeTag(red)))
                        aktiven.zatvoren = true;
                    else
                    {
                        valid = 0;
                        break;
                    }
                    aktiven = aktiven.parent;
                }
                //System.out.println(imeTag(redovi[i]));
            }
        }

        //root.print();
        System.out.println(valid);

        br.close();
    }
}