using System;
using System.Text;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using static System.Console;
using static System.Math;

namespace AtCoder
{
    public class Program
    {
        public static void Main(string[] args)
        {
            new Program().Solve(new ConsoleInput(Console.In, ' '));
        }

        public void Solve(ConsoleInput cin)
        {
            var N = cin.ReadInt;
            var M = cin.ReadInt;
            var X = cin.ReadInt;

            var books = new List<int[]>();
            for (int i = 0; i < N; i++)
            {
                var book = new int[M + 1];
                book[0] = cin.ReadInt;
                for (int j = 0; j < M; j++)
                {
                    book[j + 1] = cin.ReadInt;
                }
                books.Add(book);
            }

            Func<List<int[]>, int, List<int[]>> GetResults = null;
            GetResults = (List<int[]> results, int count) =>
            {
                if (count >= N) return results;

                var resultZoro = this.GetDeepCopy(results);

                var book = books[count];

                var resultOne = new List<int[]>(results);
                foreach (var res in resultOne)
                {
                    for (int i = 0; i < M + 1; i++)
                    {
                        res[i] += book[i];
                    }
                }

                var newResults = new List<int[]>();
                newResults.AddRange(resultZoro);
                newResults.AddRange(resultOne);

                return GetResults(newResults, count + 1);
            };

            var results = GetResults(new List<int[]>() { new int[M + 1] }, 0);

            var min = -1;
            foreach (var result in results)
            {
                var check = true;
                for (int i = 1; i < result.Length; i++)
                {
                    if (result[i] < X) check = false;
                }
                if (check) {
                    if(min == -1) min = result[0];
                    if (min > result[0]) min = result[0]; 
                }
            }
            WriteLine(min);
        }

        public List<int[]>GetDeepCopy(List<int[]> target)
        {
            var result = new List<int[]>();
            foreach (var array in target)
            {
                var newArray = new int[array.Length];
                Array.Copy(array,newArray,array.Length);
                result.Add(newArray);
            }
            return result;
        }
    }

    public class ConsoleInput
    {
        private readonly System.IO.TextReader _stream;
        private char _separator = ' ';
        private Queue<string> inputStream;
        public ConsoleInput(System.IO.TextReader stream, char separator = ' ')
        {
            this._separator = separator;
            this._stream = stream;
            inputStream = new Queue<string>();
        }

        public string Read
        {
            get
            {
                if (inputStream.Count != 0) return inputStream.Dequeue();
                string[] tmp = _stream.ReadLine().Split(_separator);
                for (int i = 0; i < tmp.Length; i++)
                    inputStream.Enqueue(tmp[i]);
                return inputStream.Dequeue();
            }
        }

        public string ReadLine { get { return _stream.ReadLine(); } }
        public int ReadInt { get { return int.Parse(Read); } }
        public long ReadLong { get { return long.Parse(Read); } }
        public double ReadDouble { get { return double.Parse(Read); } }
        public string[] ReadStrArray(long N) { var ret = new string[N]; for (long i = 0; i < N; ++i) ret[i] = Read; return ret; }
        public int[] ReadIntArray(long N) { var ret = new int[N]; for (long i = 0; i < N; ++i) ret[i] = ReadInt; return ret; }
        public long[] ReadLongArray(long N) { var ret = new long[N]; for (long i = 0; i < N; ++i) ret[i] = ReadLong; return ret; }
    }

    public static class TestCheck
    {
        public static void Display(int[] array)
        {
            var txt = "";
            foreach (var item in array)
            {
                txt += " " + item.ToString();
            }
            WriteLine("{0}", txt);
        }

        public static void Display(int index, int[] array)
        {
            var txt = "";
            foreach (var item in array)
            {
                txt += " " + item.ToString();
            }
            WriteLine("{0} : {1}", index, txt);
        }

        public static void Display(List<int>[] list)
        {
            for (int i = 0; i < list.Length; i++)
            {
                Display(i, list[i].ToArray());
            }
        }

        public static void Display(List<int[]> list)
        {
            for (int i = 0; i < list.Count; i++)
            {
                Display(i, list[i].ToArray());
            }
        }

        public static void Display(int index,List<int[]> list)
        {
            for (int i = 0; i < list.Count; i++)
            {
                Display(index, list[i].ToArray());
            }
        }

        public static void DisplayLine(string text)
        {
            WriteLine("----------" + text + "----------");
        }

        public static void DisplayLine()
        {
            DisplayLine("");
        }
    }
}


Measured memory_bytes: 28452