#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
typedef long long ll;
typedef long double lld;
typedef long long int lli;
using namespace std;
const int N = 1000001;
const int MOD = 1e9+7;
const bool DEBUG = 1;
#define sd(x) scanf("%d ", &x)
#define sd2(x, y) scanf("%d%d", &x, &y)
#define sd3(x, y, z) scanf("%d%d%d", &x, &y, &z)
#define endl "\n"
#define fi first
#define se second
#define eb emplace_back
#define fbo find_by_order
#define ook order_of_key
#define pb(x) push_back(x)
#define mp(x, y) make_pair(x, y)
#define LET(x, a) __typeof(a) x(a)
#define foreach(it, v) for (LET(it, v.begin()); it != v.end(); it++)
#define MEMS(a, b) memset(a, b, sizeof(a))
#define _			\
    ios_base::sync_with_stdio(false);			\
    cin.tie(NULL);			\
    cout.tie(NULL);
#define __			\
    freopen("input.txt", "r", stdin);			\
    freopen("output.txt", "w", stdout);
#define all(c) c.begin(), c.end()
#define inf 1000000000000000001
#define epsilon 1e-6
#define int ll
#define RUN_T			\
    int _t;			\
    cin >> _t;			\
    while (_t--)
#define tr(...)			\
if (DEBUG) {			\
    cout << __FUNCTION__ << ' ' << __LINE__ << " = ";			\
    trace(#__VA_ARGS__, __VA_ARGS__);			\
}
template <typename S, typename T>
ostream &operator<<(ostream &out, pair<S, T> const &p) {
    out << '(' << p.fi << ", " << p.se << ')';
    return out;
}
template <typename T>
ostream &operator<<(ostream &out, set<T> const &v) {
    for (auto i = v.begin(); i != v.end(); i++)
        out << (*i) << ' ';
    return out;
}
template <typename T, typename V>
ostream &operator<<(ostream &out, map<T, V> const &v) {
    for (auto i = v.begin(); i != v.end(); i++)
        out << "\n" << (i->first) <<  ":"  << (i->second);
    return out;
}
template <typename T, typename V>
ostream &operator<<(ostream &out, unordered_map<T, V> const &v) {
    for (auto i = v.begin(); i != v.end(); i++)
        out << "\n" << (i->first) <<  ":"  << (i->second);
    return out;
}
template <typename T>
ostream &operator<<(ostream &out, multiset<T> const &v) {
    for (auto i = v.begin(); i != v.end(); i++)
        out << (*i) << ' ';
    return out;
}
template <typename T>
ostream &operator<<(ostream &out, unordered_set<T> const &v) {
    for (auto i = v.begin(); i != v.end(); i++)
        out << (*i) << ' ';
    return out;
}
template <typename T>
ostream &operator<<(ostream &out, unordered_multiset<T> const &v) {
    for (auto i = v.begin(); i != v.end(); i++)
        out << (*i) << ' ';
    return out;
}
template <typename T> ostream &operator<<(ostream &out, vector<T> const &v) {
    ll l = v.size();
    for (ll i = 0; i < l - 1; i++)
        out << v[i] << ' ';
    if (l > 0)
        out << v[l - 1];
    return out;
}
template <typename T> void trace(const char *name, T &&arg1) {
    cout << name <<  ":"  << arg1 << endl;
}
template <typename T, typename... Args>
void trace(const char *names, T &&arg1, Args &&... args) {
    const char *comma = strchr(names + 1, ',');
    cout.write(names, comma - names) <<  ":"  << arg1 <<  "|" ;
    trace(comma + 1, args...);
}
template <typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
int gcd(int a, int b) {
     if (b == 0)
           return a;
     return gcd(b, a % b);
}
vector<vector<int>>dp;
int ans = 0;
int n ,m, x, mini = INT_MAX;
bool check(vector<int>&v){
    for(int i = 0 ; i < v.size(); i++){
        if(v[i] < x) return false;
    }
    return true;
}
void recur(int i ,int cnt, vector<int>&a){
    if( i == n){
        if(check(a)){
            // cout << mini <<" "<<cnt << endl;
            // tr(i, mini, cnt);
            mini = min(mini, cnt);
        }
        return;
    }
    vector<int>temp(m);
    for(int j = 1; j <= m ;j++){
        temp[j - 1] = a[j - 1] + dp[i][j];
    }
    recur(i + 1,cnt +  dp[i][0], temp);
    recur(i + 1, cnt , a);
    return;
}
int32_t main(){
    cin >> n >> m >> x;
    dp.resize(n + 1 , vector<int>(m + 1, 0));
    for(int i = 0 ; i < n; i++){
        for(int j = 0; j <= m; j++){
            cin >> dp[i][j];
        }
    }
    vector<int>v(m, 0);
    recur(0, 0, v);
    if( mini == INT_MAX){
        cout << -1 <<endl;
    }else{
        cout << mini << endl;
    }
}

Measured memory_bytes: 3588