import java.util.*;
import java.io.*;

public class Main {
    public static void main(String[] args) {
        FastScanner sc = new FastScanner();
        int n = sc.nextInt();
        int m = sc.nextInt();
        long x = sc.nextLong();
        long[][] c = new long[n][m+1];
        for (int i = 0; i < c.length; i++) {
            for (int j = 0; j < m+1; j++) {
                c[i][j] = sc.nextLong();
            }
        }

        long ans = Long.MAX_VALUE;

        for (int i = 0; i < 1 << n; i++) {
            long[] mskill = new long[m]; 
            long mcost = 0;
            for (int j = 0; j < n; j++) {
                if((i & (1 << j)) > 0){
                    for (int j2 = 0; j2 < m; j2++) {
                        mskill[j2] += c[j][j2+1];
                    }
                    mcost += c[j][0];
                }
            }

            boolean ok = true;
            for (int j = 0; j < mskill.length; j++) {
                if(mskill[j] < x){
                    ok = false;
                    break;
                }
            }

            if(ok) ans = Math.min(ans, mcost);
        }

        if(ans != Long.MAX_VALUE){
            System.out.println(ans);
        }else{
            System.out.println(-1);
        }
    }




    private static 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());}
    }
}


Measured memory_bytes: 33964