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
 1
4 6 9 8 2 7
 2
1 7 6 9 2 5
1 6 7 0 9 2
 3
4 1 0 8 0 2
1 5 3 5 0 7
7 7 2 7 2 2
 1
7 6 5 8 9 0
 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
 2
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
 1
6 2 8 4 5 1
 1
4 0 9 6 3 1
 2
6 0 1 7 2 9
1 3 4 6 7 0
 3
5 0 7 6 2 1
2 7 4 6 1 9
0 2 6 1 7 5
 3
0 1 1 2 2 3
4 5 6 7 8 9
3 4 5 6 7 8
 3
0 1 2 3 4 5
0 1 2 3 4 5
0 1 2 3 4 5
 2
2 4 0 3 7 6
3 2 8 7 1 5
 1
7 3 6 9 8 1
 3
1 1 2 3 4 5
6 7 8 9 0 2
3 4 5 6 7 8
 3
9 4 3 0 2 6
7 0 5 3 3 9
1 0 7 4 6 7
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2 5 7 4 2 7
1 5 5 9 0 3
8 2 0 1 5 1
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1 7 8 6 0 9
3 2 1 7 4 9
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0 8 6 2 1 3
5 2 7 1 0 9
 2
5 3 2 9 8 2
0 7 4 8 1 8
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3 8 5 1 5 5
1 5 7 2 6 9
4 3 4 8 8 9
 2
5 1 2 3 0 8
3 6 7 4 9 2
 2
0 1 2 3 4 5
6 7 8 9 1 2
 1
5 3 8 0 2 6
 1
0 7 6 3 2 4
 2
8 0 6 5 1 4
7 1 0 8 3 4
 2
7 8 6 1 4 5
8 6 4 3 2 5
 2
0 1 2 3 4 5
6 6 6 7 8 9
 3
9 3 1 8 4 6
6 9 1 2 0 7
8 9 1 5 0 3
 3
0 6 2 9 5 4
3 8 0 1 6 9
6 9 0 1 5 2
 3
0 1 2 2 4 5
6 7 8 9 0 1
3 3 4 5 6 7
 1
1 4 5 7 0 5
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8 6 4 1 2 0
7 8 5 3 2 1
 3
5 6 2 9 3 5
5 4 1 5 9 8
4 4 2 0 3 5
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 3
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0 3 8 4 7 6
1 4 5 8 7 0
 3
9 4 3 3 9 3
1 0 3 4 5 3
2 9 6 2 4 1
 3
1 2 3 7 8 9
9 8 7 1 2 3
7 9 2 3 1 8
 3
8 1 8 2 7 1
9 1 9 9 4 7
0 0 9 0 4 0
 1
2 5 9 6 7 9
 3
4 6 0 3 9 2
8 6 9 0 7 2
6 9 3 2 5 7
 3
8 6 0 5 4 9
1 8 5 3 9 7
7 4 5 1 6 8
 1
8 6 0 9 4 2
 1
7 9 2 5 0 4
 1
6 0 7 5 4 8
 2
5 8 4 7 1 2
0 8 6 2 4 9
 1
5 2 2 5 6 7
 2
6 5 2 7 1 3
3 7 8 1 0 9
 1
8 3 5 4 2 9
 3
0 1 2 3 4 5
6 7 8 9 1 2
3 4 5 6 7 8
 2
6 6 4 7 9 0
2 1 2 8 6 4
 3
2 3 4 5 6 7
3 4 5 6 7 8
9 1 2 3 4 5
 2
0 1 2 3 4 5
4 5 6 7 8 9
 3
2 7 3 6 4 5
0 2 1 9 4 8
8 6 9 5 4 0
 2
0 1 2 3 4 5
6 7 8 9 6 6
 2
1 7 2 0 4 3
5 2 3 6 1 0
 1
6 2 8 5 1 3
 3
5 4 8 1 6 7
0 9 3 5 8 6
2 4 7 8 1 3
 1
6 3 1 9 4 9
 3
0 1 9 1 0 8
9 9 3 5 6 2
9 3 9 9 7 3
 3
8 1 6 8 6 8
7 0 2 5 8 4
5 2 0 3 1 9
 3
2 0 1 3 4 5
6 7 8 9 1 1
3 4 5 6 6 7
 3
4 4 5 0 6 6
7 1 6 9 5 4
5 0 4 0 3 9
 2
0 1 2 3 4 5
9 8 7 6 5 4
 2
0 2 9 1 8 5
0 7 4 3 2 5
 2
2 3 9 1 6 7
2 5 4 3 0 6
 2
5 7 4 2 1 9
2 2 7 1 1 8
 1
3 9 1 7 4 5
 3
7 7 2 5 3 2
3 0 0 6 4 4
1 2 1 1 9 1
 1
7 9 5 0 4 6
 3
7 1 3 0 2 4
2 4 3 0 9 5
1 9 8 0 6 5
 1
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.util.*;
    import java.lang.*;
    import java.math.*;
    import java.io.*;
     
    /* N1k5 De5@1 */
     
    public class codeforces implements Runnable { 
     
    	static class InputReader
    	{
    		private InputStream stream;
    		private byte[] buf = new byte[1024];
    		private int curChar;
    		private int numChars;
    		private SpaceCharFilter filter;
    		
    		public InputReader(InputStream stream)
    		{
    			this.stream = stream;
    		}
    		
    		public int read()
    		{
    			if (numChars==-1) 
    				throw new InputMismatchException();
    			
    			if (curChar >= numChars)
    			{
    				curChar = 0;
    				try 
    				{
    					numChars = stream.read(buf);
    				}
    				catch (IOException e)
    				{
    					throw new InputMismatchException();
    				}
    				
    				if(numChars <= 0)				
    					return -1;
    			}
    			return buf[curChar++];
    		}
    	 
    		public String nextLine()
    		{
    			BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    			String str = "";
                try
                {
                    str = br.readLine();
                }
                catch (IOException e)
                {
                    e.printStackTrace();
                }
                return str;
    		}
    		public int nextInt()
    		{
    			int c = read();
    			
    			while(isSpaceChar(c)) 
    				c = read();
    			
    			int sgn = 1;
    			
    			if (c == '-') 
    			{
    				sgn = -1;
    				c = read();
    			}
    			
    			int res = 0;
    			do 
    			{
    				if(c<'0'||c>'9') 
    					throw new InputMismatchException();
    				res *= 10;
    				res += c - '0';
    				c = read();
    			}
    			while (!isSpaceChar(c)); 
    			
    			return res * sgn;
    		}
    		
    		public long nextLong() 
    		{
    			int c = read();
    			while (isSpaceChar(c))
    				c = read();
    			int sgn = 1;
    			if (c == '-') 
    			{
    				sgn = -1;
    				c = read();
    			}
    			long res = 0;
    			
    			do 
    			{
    				if (c < '0' || c > '9')
    					throw new InputMismatchException();
    				res *= 10;
    				res += c - '0';
    				c = read();
    			}
    			while (!isSpaceChar(c));
    				return res * sgn;
    		}
    		
    		public double nextDouble() 
    		{
    			int c = read();
    			while (isSpaceChar(c))
    				c = read();
    			int sgn = 1;
    			if (c == '-') 
    			{
    				sgn = -1;
    				c = read();
    			}
    			double res = 0;
    			while (!isSpaceChar(c) && c != '.') 
    			{
    				if (c == 'e' || c == 'E')
    					return res * Math.pow(10, nextInt());
    				if (c < '0' || c > '9')
    					throw new InputMismatchException();
    				res *= 10;
    				res += c - '0';
    				c = read();
    			}
    			if (c == '.') 
    			{
    				c = read();
    				double m = 1;
    				while (!isSpaceChar(c)) 
    				{
    					if (c == 'e' || c == 'E')
    						return res * Math.pow(10, nextInt());
    					if (c < '0' || c > '9')
    						throw new InputMismatchException();
    					m /= 10;
    					res += (c - '0') * m;
    					c = read();
    				}
    			}
    			return res * sgn;
    		}
    		
    		public String readString() 
    		{
    			int c = read();
    			while (isSpaceChar(c))
    				c = read();
    			StringBuilder res = new StringBuilder();
    			do 
    			{
    				res.appendCodePoint(c);
    				c = read();
    			} 
    			while (!isSpaceChar(c));
    			
    			return res.toString();
    		}
    	 
    		public boolean isSpaceChar(int c) 
    		{
    			if (filter != null)
    				return filter.isSpaceChar(c);
    			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
    		}
    	 
    		public String next() 
    		{
    			return readString();
    		}
    		
    		public interface SpaceCharFilter 
    		{
    			public boolean isSpaceChar(int ch);
    		}
    	}
        
        public void run() {
    		
    		InputReader s = new InputReader(System.in);
    		PrintWriter w = new PrintWriter(System.out);
    		
    		int t = 1;
    		while(t-- > 0) {
    			int n = s.nextInt();
                ArrayList<Integer> list = new ArrayList<Integer>();
                ArrayList<Integer> list1 = new ArrayList<Integer>();
                HashSet<Integer> h = new HashSet<Integer>();
                int max = 0;
                int[] freq = new int[10];
                while(n-->0){
                    for(int i=0;i<6;i++){
                        int x = s.nextInt();
                        list.add(x);
                    }
                }
                Collections.sort(list);
                for(int i=0;i<list.size();i++){
                    freq[list.get(i)]++;
                }
                for(int i=0;i<10;i++) {
                    list1.add(freq[i]);
                    h.add(freq[i]);
                }
                int min = Collections.min(list1);
                int p = 0;
                if(h.size()>1){
                    for(int i=1;i<list.size();i++){
                        if(min==freq[i]) {
                            p = i;
                            break;
                        }
                    }
                    w.println(p*(int)Math.pow(10,min)+p-1);
                }
                else w.println("99");
              
            }
                
            
    		
    		w.close();
            
    	}
    	
        
    	public static void main(String args[]) throws Exception
    	{
    		new Thread(null, new codeforces(),"codeforces",1<<26).start();
    	}
    	   
    }  