import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;

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

    static class CSkillUp {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            int m = in.nextInt();
            int x = in.nextInt();
            int c[] = new int[n];
            int a[][] = new int[n][m];
            for (int i = 0; i < n; i++) {
                c[i] = in.nextInt();
                for (int j = 0; j < m; j++) {
                    a[i][j] = in.nextInt();
                }
            }
            int ans = 12345678;
            int all = 1 << n;
            for (int mask = 0; mask < all; mask++) {
                int level[] = new int[m];
                int cost = 0;
                for (int i = 0; i < n; i++) {
                    if (((mask >> i) & 1) > 0) {
                        cost += c[i];
                        for (int j = 0; j < m; j++) {
                            level[j] += a[i][j];
                        }
                    }
                }
                boolean ok = true;
                for (int j = 0; j < m; j++) {
                    if (level[j] < x)
                        ok = false;
                }
                if (ok)
                    ans = Math.min(ans, cost);
            }
            if (ans == 12345678)
                out.println(-1);
            else
                out.println(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 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 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);

        }

    }
}



Measured memory_bytes: 33932