using System;
using System.Linq;
using System.Collections.Generic;

namespace Algorithm
{
    class Program
    {
        static int N, M, K;
        static int[][] A;
        static int[,] dp = new int[11, 11];
        static void Main(string[] args)
        {
            var l = Console.ReadLine().Split().Select(int.Parse).ToArray();
            N = l[0];
            M = l[1];
            K = l[2];
            A = new int[N][];

            for (var i = 0; i < N; i++) A[i] = Console.ReadLine().Split().Select(int.Parse).ToArray();

            var ans = Dfs(0, 0);
            Console.WriteLine(ans == 0 ? -1 : K - ans);

        }

        static int Dfs(int n, int total)
        {
            if (total > K) return -1;

            if (n == N)
            {
                if (total <= K) return total;
                else return -1;
            }

            var max = 0;
            for (var i = 0; i < M; i++)
            {
                var t = Dfs(n + 1, total + A[n][i]);
                max = Math.Max(max, t);
            }

            return max;
        }
    }
}