typedef long long ll;
typedef long double ld;
#include <bits/stdc++.h>
using namespace std;


int main() {
    ll n,m,k;
    std::cin >> n>>m>>k;
    
    vector<vector<ll>> a(n,vector<ll>(m));
    
    ll minv = 0;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            std::cin >> a[i][j];
        }
        minv += a[i][0];
    }

    if(minv>k){
        std::cout << -1 << std::endl;
        return 0;
    }
    
        if(n==1){
        ll now = 0;
        for (int i = 0; i < m; i++) {
            if(a[0][i]<=k)now = a[0][i];
        }
        std::cout << k-now << std::endl;
        return 0;
    }
    vector<ll> v1,v2;

    function<void(int, int)> rec = [&] (int now, int val) {
        if(now==n/2){
            v1.push_back(val);
            return;
        }
        for (int i = 0; i < m; i++) {
            rec(now+1, val + a[now][i]);
        }
    };
    function<void(int, int)> rec2 = [&] (int now, int val) {
        if(now==n){
            v2.push_back(val);
            return;
        }

        for (int i = 0; i < m; i++) {
            rec2(now+1, val + a[now][i]);
        }
    };
    
    rec(0,0);
    rec2(n/2,0);
    sort(v1.begin(),v1.end());
    sort(v2.begin(),v2.end());

    ll ans = k;
    for (auto e : v1) {
        if(e>=k)continue;
        auto itr = upper_bound(v2.begin(),v2.end(),k-e);
        if(itr == v2.begin()){
            continue;
        }else{
            --itr;
            ans = min(ans,k-e-*itr);
        }
    }
    std::cout << ans << std::endl;
}