#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define ll long long
#define rep(i,n) for (int i = 0; i < (n); i++)
#define coutf(f) cout << fixed << setprecision(f)
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()

int main() {
    int n, m, k;
    cin >> n >> m >> k;
    vector<vector<int>> a(n, vector<int>(m));
    rep(i, n) rep(j, m) cin >> a[i][j];
    vector<set<int>> v(n);
    rep(i, m) v[0].insert(a[0][i]);
    for (int i = 1; i < n; i++) {
        for (auto t : v[i - 1]) {
            rep(j, m) {
                v[i].insert(t + a[i][j]);
            }
        }
    }
    int mx = 0;
    for (auto t : v[n - 1]) {
        if(t <= k) mx = max(mx, t);
    }
    int ans = k - mx;
    if (k == ans) cout << -1 << endl;
    else cout << ans << endl;
    return 0;
}