import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.BufferedWriter;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author maheshwari29
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        OutputWriter out = new OutputWriter(outputStream);
        CSkillUp solver = new CSkillUp();
        solver.solve(1, in, out);
        out.close();
    }

    static class CSkillUp {
        static int n;
        static int m;
        static long x;
        static long c[];
        static long temp[][];

        public void solve(int testNumber, InputReader in, OutputWriter out) {
            int i, j;
            n = in.ni();
            m = in.ni();
            x = in.nl();
            c = new long[n];
            temp = new long[n][m];
            for (i = 0; i < n; i++) {
                c[i] = in.nl();
                for (j = 0; j < m; j++)
                    temp[i][j] = in.nl();
            }
            //out.println(c);
            long ans = func(0, "");
            if (ans == 1000000000000l)
                out.println("-1");
            else
                out.println(ans);

        }

        public long func(int index, String s) {
            if (index == n) {  // System.out.println(index+" "+s);
                long a[] = new long[m];
                long cost = 0;
                for (int i = 0; i < n; i++) {
                    if (s.charAt(i) == '1') {
                        cost += c[i];
                        for (int j = 0; j < m; j++) {
                            a[j] += temp[i][j];

                        }
                    }
                }
                //for(long c:a)
                //    System.out.print(c+" ");
                //System.out.println(cost+" -----------");

                int flag = 0;
                for (long c : a)
                    if (c < x)
                        flag = 1;
                if (flag == 1)
                    return (long) 1e12;
                return cost;
            }


            long ans = Math.min(func(index + 1, s + "1"), func(index + 1, s + "0"));
            return ans;
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private InputReader.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 int ni() {
            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 nl() {
            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 boolean isSpaceChar(int c) {
            if (filter != null) {
                return filter.isSpaceChar(c);
            }
            return isWhitespace(c);
        }

        public static boolean isWhitespace(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        }

    }

    static class OutputWriter {
        private final PrintWriter writer;

        public OutputWriter(OutputStream outputStream) {
            writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
        }

        public OutputWriter(Writer writer) {
            this.writer = new PrintWriter(writer);
        }

        public void print(Object... objects) {
            for (int i = 0; i < objects.length; i++) {
                if (i != 0) {
                    writer.print(' ');
                }
                writer.print(objects[i]);
            }
        }

        public void println(Object... objects) {
            print(objects);
            writer.println();
        }

        public void close() {
            writer.close();
        }

        public void println(long i) {
            writer.println(i);
        }

    }
}



Measured memory_bytes: 39076