2
2 6 8 1 3 1
2 1 3 8 6 7
 2
1 8 9 1 1 0
2 3 4 5 6 7
 2
0 2 9 8 1 7
6 7 4 3 2 5
 3
9 4 6 2 7 0
3 7 1 9 6 4
6 1 0 8 7 2
 3
2 7 4 0 7 1
5 5 4 9 1 4
2 1 7 5 1 7
 3
5 1 2 9 6 4
9 0 6 4 2 8
4 6 2 8 3 7
 3
1 1 1 0 2 3
4 5 6 7 8 9
0 0 0 0 0 0
 1
1 9 8 3 7 8
 3
2 6 3 7 1 0
9 1 2 4 7 6
1 4 8 7 6 2
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1 7 6 9 2 5
1 6 7 0 9 2
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4 1 0 8 0 2
1 5 3 5 0 7
7 7 2 7 2 2
 1
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 3
3 8 3 5 5 5
3 0 1 6 6 3
0 4 3 7 2 4
 1
8 1 9 2 9 7
 2
2 0 5 7 0 8
4 5 1 5 4 9
 3
1 1 1 1 1 1
0 2 3 4 5 6
7 8 9 2 3 4
 3
0 1 1 2 2 3
4 5 6 7 8 9
3 4 5 6 7 1
 1
0 8 7 1 3 2
 2
9 3 3 6 7 2
6 2 9 1 5 9
 1
8 2 7 4 1 0
 2
3 6 8 9 5 0
6 7 0 8 2 3
 1
0 1 2 3 4 5
 3
3 4 5 6 8 9
1 1 1 1 1 1
1 2 4 5 7 0
 2
2 3 5 1 9 6
1 6 8 7 3 9
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0 9 5 7 6 2
8 6 2 7 1 4
 2
4 3 8 6 0 1
4 7 1 8 9 0
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6 2 8 4 5 1
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1 3 4 6 7 0
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2 7 4 6 1 9
0 2 6 1 7 5
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4 5 6 7 8 9
3 4 5 6 7 8
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0 1 2 3 4 5
0 1 2 3 4 5
0 1 2 3 4 5
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3 2 8 7 1 5
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7 3 6 9 8 1
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1 1 2 3 4 5
6 7 8 9 0 2
3 4 5 6 7 8
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9 4 3 0 2 6
7 0 5 3 3 9
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1 5 5 9 0 3
8 2 0 1 5 1
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5 2 7 1 0 9
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0 7 4 8 1 8
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6 9 1 2 0 7
8 9 1 5 0 3
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1 0 3 4 5 3
2 9 6 2 4 1
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9 8 7 1 2 3
7 9 2 3 1 8
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0 0 9 0 4 0
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7 4 5 1 6 8
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0 8 6 2 4 9
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3 7 8 1 0 9
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6 7 8 9 1 2
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6 6 4 7 9 0
2 1 2 8 6 4
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3 4 5 6 7 8
9 1 2 3 4 5
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0 2 1 9 4 8
8 6 9 5 4 0
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6 7 8 9 6 6
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5 2 3 6 1 0
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2 4 7 8 1 3
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9 3 9 9 7 3
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7 0 2 5 8 4
5 2 0 3 1 9
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5 0 4 0 3 9
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0 7 4 3 2 5
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2 5 4 3 0 6
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2 2 7 1 1 8
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3 0 0 6 4 4
1 2 1 1 9 1
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2 4 3 0 9 5
1 9 8 0 6 5
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4 3 8 9 2 3

3
 9
 9
 4
 2
 10
 10
 1
 4
 0
 2
 5
 0
 8
 2
 2
 10
 19
 3
 3
 2
 0
 5
 19
 3
 2
 1
 2
 1
 4
 2
 9
 5
 8
 1
 10
 7
 0
 5
 4
 3
 5
 9
 9
 29
 0
 0
 1
 8
 9
 21
 6
 21
 1
 8
 6
 1
 21
 6
 3
 2
 0
 0
 1
 0
 0
 0
 2
 0
 3
 0
 98
 2
 9
 9
 10
 9
 7
 3
 21
 1
 3
 32
 19
 1
 9
 5
 7
 2
 1
 7
 0
 65
 0

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;


import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;

public class Main{
	
	static class Reader
    {
        final private int BUFFER_SIZE = 1 << 16;
        private DataInputStream din;
        private byte[] buffer;
        private int bufferPointer, bytesRead;
 
        public Reader()
        {
            din = new DataInputStream(System.in);
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }
 
        public Reader(String file_name) throws IOException
        {
            din = new DataInputStream(new FileInputStream(file_name));
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }
 
        public String readLine() throws IOException
        {
            byte[] buf = new byte[200005]; // line length+1
            int cnt = 0, c;
            while ((c = read()) != -1)
            {
                if (c == '\n')
                    break;
                buf[cnt++] = (byte) c;
            }
            return new String(buf, 0, cnt);
        }
 
        public int nextInt() throws IOException
        {
            int ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do
            {
                ret = ret * 10 + c - '0';
            }  while ((c = read()) >= '0' && c <= '9');
 
            if (neg)
                return -ret;
            return ret;
        }
 
        public long nextLong() throws IOException
        {
            long ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            }
            while ((c = read()) >= '0' && c <= '9');
            if (neg)
                return -ret;
            return ret;
        }
 
        public double nextDouble() throws IOException
        {
            double ret = 0, div = 1;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
 
            do {
                ret = ret * 10 + c - '0';
            }
            while ((c = read()) >= '0' && c <= '9');
 
            if (c == '.')
            {
                while ((c = read()) >= '0' && c <= '9')
                {
                    ret += (c - '0') / (div *= 10);
                }
            }
 
            if (neg)
                return -ret;
            return ret;
        }
 
        private void fillBuffer() throws IOException
        {
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
            if (bytesRead == -1)
                buffer[0] = -1;
        }
 
        private byte read() throws IOException
        {
            if (bufferPointer == bytesRead)
                fillBuffer();
            return buffer[bufferPointer++];
        }
 
        public void close() throws IOException
        {
            if (din == null)
                return;
            din.close();
        }
    }
	
	static class FastScanner {

	    private final BufferedReader bufferedReader;
	    private StringTokenizer stringTokenizer;

	    public FastScanner() {
	        bufferedReader = new BufferedReader(new InputStreamReader(System.in));
	    }

	    public String next() {
	        while (stringTokenizer == null || !stringTokenizer.hasMoreElements()) {
	            try {
	                stringTokenizer = new StringTokenizer(bufferedReader.readLine());
	            } catch (IOException e) {
	                throw new RuntimeException("Can't read next value", e);
	            }
	        }
	        return stringTokenizer.nextToken();
	    }

	    public int nextInt() {
	        return Integer.parseInt(next());
	    }

	    public long nextLong() {
	        return Long.parseLong(next());
	    }

	    public double nextDouble() {
	        return Double.parseDouble(next());
	    }

	    public String nextLine(){
	        String str = "";
	        try {
	            str = bufferedReader.readLine();
	        } catch (IOException e) {
	            e.printStackTrace();
	        }
	        return str;
	    }
	}
	
	static void closeall() throws IOException{
		printWriter.close();
		sc.close();
		in.close();
	}
	static Scanner sc = new Scanner(System.in);
	static Reader in = new Reader();
	static FastScanner fastScanner = new FastScanner();
	static PrintWriter printWriter = new PrintWriter(new BufferedOutputStream(System.out));
	static BufferedReader read = new BufferedReader(new InputStreamReader(System.in));
	static long INF = (long)(1e18);

	static long query(int i,long[] bit){
		long sum = 0;
		for(;i>0;i-=(i&-i))
			sum=(sum%mod+bit[i]%mod)%mod;
		return sum;
	}
	static void update(int i,long val,long[] bit){
		for(;i<=1000000;i+=(i&-i))
			bit[i]=(bit[i]%mod+val%mod)%mod;
	}
	int V,E;
	ArrayList<Integer> adj[];
	Main(){
	}
	Main(int v,int e){
		V=v;
		E=e;
		adj=new ArrayList[v];
		for(int i=0;i<v;i++)
			adj[i] = new ArrayList<>();
	}
	void addEdge(int u,int v){
		adj[u].add(v);
		adj[v].add(u);
	}
	
	
	static long power(long a,long k)
	{
		long m = 998244353;
	    long ans=1;
	    long tmp=a%m;
	    while(k>0)
	    {
	        if(k%2==1)
	        	ans=ans*tmp%m;
	        tmp=tmp*tmp%m;
	        k>>=1;
	    }
	    return ans;
	}
	
	static class Pair implements Comparable<Pair>{
		int a,b;
		Pair(int x,int y){
			a = x;
			b = y;
		}
		public int compareTo(Pair ob){
			return this.a-ob.a;
		}
		
	}
	static long mod = 1000000007;
	public static void main(String args[])throws IOException{
		int n = in.nextInt();
		HashSet<Integer> a = new HashSet<>();
		HashSet<Integer> b = new HashSet<>();
		HashSet<Integer> c = new HashSet<>();
		for(int i=0;i<6;i++){
			int x = in.nextInt();
			a.add(x);
		}
		for(int i=0;i<6 && n>=2 ;i++){
			int x = in.nextInt();
			b.add(x);
		}
		for(int i=0;i<6 && n>=3;i++){
			int x = in.nextInt();
			c.add(x);
		}
		int i = 0;
		while(true){
			i++;
			if(a.contains(i) || b.contains(i) || c.contains(i))
				continue;
			if(a.contains(i%10) && (b.contains((i/10)%10) || c.contains((i/10)%10)))
				continue;
			if(b.contains(i%10) && (a.contains((i/10)%10) || c.contains((i/10)%10)))
					continue;
			if(c.contains(i%10) && (b.contains((i/10)%10) || a.contains((i/10)%10)))
					continue;
			int j = i;
			int p = j%10;
			j/=10;
			int q = j%10;
			j/=10;
			int r = j%10;
			if(a.contains(p) && b.contains(q) && c.contains(r))
				continue;
			if(a.contains(p) && b.contains(r) && c.contains(q))
				continue;
			if(a.contains(q) && b.contains(p) && c.contains(r))
				continue;
			if(a.contains(q) && b.contains(r) && c.contains(p))
				continue;
			if(a.contains(r) && b.contains(q) && c.contains(p))
				continue;
			if(a.contains(r) && b.contains(p) && c.contains(q))
				continue;
			printWriter.println(i-1);
			break;
		}
		closeall();
	}
}