import java.io.IOException;
import java.io.InputStream;
import java.util.NoSuchElementException;

class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;

    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }

    private int readByte() {
        if (hasNextByte())
            return buffer[ptr++];
        else
            return -1;
    }

    private static boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }

    public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
        return hasNextByte();
    }

    public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }

    public long nextLong() {
        if (!hasNext())
            throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }

    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
            throw new NumberFormatException();
        return (int) nl;
    }

    public double nextDouble() {
        return Double.parseDouble(next());
    }
}

public class Main {
    // static int MOD = 1000000007;

    // public static class Mas {
    // int x;
    // int y;
    // int step;

    // Mas(int x, int y, int step) {
    // this.x = x;
    // this.y = y;
    // this.step = step;
    // }
    // }

    static long pow(long l, long i) {
        if (i == 0)
            return 1;
        else {
            if (i % 2 == 0) {
                long val = pow(l, i / 2);
                return val * val % 2019;
            } else {
                return pow(l, i - 1) * l % 2019;
            }
        }
    }

    private static final int[] vX = { 1, 0, 0, -1 };
    private static final int[] vY = { 0, 1, -1, 0 };
    static int N;
    static int M;
    static int X;
    static int[] C;
    static int[][] A;
    static int min;

    public static void main(String[] args) {
        FastScanner fs = new FastScanner();
        N = fs.nextInt();
        M = fs.nextInt();
        X = fs.nextInt();
        C = new int[N];
        A = new int[N][M];
        min = Integer.MAX_VALUE / 2;
        for (int i = 0; i < N; i++) {
            C[i] = fs.nextInt();
            for (int j = 0; j < M; j++) {
                A[i][j] = fs.nextInt();
            }
        }
        for (int bit = 0; bit < (1 << N); bit++) {
            int[] us = new int[M];
            int cost = 0;
            for (int j = 0; j < N; j++) {
                if ((bit >> j & 1) == 1) {
                    for (int i = 0; i < M; i++) {
                        us[i] += A[j][i];
                    }
                    cost += C[j];
                }
            }
            boolean flag = false;
            for (int i = 0; i < M; i++) {
                // System.out.print(us[i] + " ");
                if (us[i] < X)
                    flag = true;
            }
            // System.out.println();
            if (!flag) {
                // System.out.println("cost" + cost);
                min = Math.min(min, cost);
            }
        }

        System.out.println(min == Integer.MAX_VALUE / 2 ? -1 : min);

    }
}


Measured memory_bytes: 33972