#pragma region Macro
#pragma region Basic
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
#define REP(i, n) for (int i = 0, i##_len = (n); i < i##_len; ++i)
#define FOR(i, a, b) for (int i = (a), i##_len = (b); i < i##_len; i++)
#define FORD(i, a, b) for (int i = (a), i##_len = (b); i > i##_len; i--)
#define FORR(t, a) for (auto t : a)
#define ALL(x) (x).begin(), (x).end()  // sortなどの引数を省略したい
#define GET(i, j) get<j>(i)
#define MT(x, ...) make_tuple(x, __VA_ARGS__)
#define SZ(x) ((int)(x).size())
//#define ZERO(x) memset(x, 0, sizeof(x))
//#define FILL(x, y) memset(x, y, sizeof(x))
#define UNUSED(x) (void(x));
#define PB push_back
#define EB emplace_back
#ifdef _DEBUG
#define PRE_COMMAND             \
    std::cin.rdbuf(in.rdbuf()); \
    cout << fixed << setprecision(15);
#else
#define PRE_COMMAND cout << fixed << setprecision(15);
#endif
const double EPS = 1e-10;
const double PI = acos(-1.0);
template <class T>
auto MAX(T& seq) {
    return *max_element(seq.begin(), seq.end());
}
template <class T>
auto MIN(T& seq) {
    return *min_element(seq.begin(), seq.end());
}
template <class T>
auto SUM(T& seq) {
    T temp{0};
    auto& temp2 = temp[0];
    return accumulate(seq.begin(), seq.end(), temp2);
}
template <class T>
void SORT(T& seq) {
    sort(seq.begin(), seq.end());
}
template <class T, class S>
void SORT(T& seq, S& sort_order) {
    sort(seq.begin(), seq.end(), sort_order);
}
template <class T>
void SORTR(vector<T>& seq) {
    sort(seq.begin(), seq.end(), greater<T>());
}
template <class T>
void CHMAX(T& a, const T& b) {
    if (a < b) { a = b; }
}
template <class T>
void CHMIN(T& a, const T& b) {
    if (b < a) { a = b; }
}
template <class T>
set<T> VECTOR_2_SET(vector<T>& v) {
    set<T> s;
    for (auto ele : v) { s.insert(ele); }
    return s;
}
template <class T>
vector<T> SET_2_VECTOR(set<T>& s) {
    vector<T> v;
    for (auto ele : s) { v.push_back(ele); }
    return v;
}
#pragma endregion Basic
#pragma region overload
template <class T, class S>
void operator+=(vector<T>& l, S& r) {
    for (auto i : r) { l.push_back(i); }
}
template <class T, class S>
void operator+=(set<T>& l, S& r) {
    for (auto i : r) { l.insert(i); }
}
template <class T, class S>
void operator+=(multiset<T>& l, S& r) {
    for (auto i : r) { l.insert(i); }
}
template <class T, class S>
vector<T> operator+(vector<T>& l, S& r) {
    vector<T> l_copy = l;
    for (auto i : r) { l_copy.push_back(i); }
    return l_copy;
}
template <class T>
vector<T> operator+(const vector<T> l, const vector<T>& r) {
    vector<T> l_copy = l;
    for (auto i : r) { l_copy.push_back(i); }
    return l_copy;
}
template <class T, class S>
set<T> operator+(set<T>& l, S& r) {
    set<T> l_copy = l;
    for (auto i : r) { l_copy.insert(i); }
    return l_copy;
}
template <class T>
set<T> operator+(const set<T> l, const set<T>& r) {
    set<T> l_copy = l;
    for (auto i : r) { l_copy.insert(i); }
    return l_copy;
}
template <class T, class S>
multiset<T> operator+(multiset<T>& l, S& r) {
    set<T> l_copy = l;
    for (auto i : r) { l_copy.insert(i); }
    return l_copy;
}
template <class T>
multiset<T> operator+(const multiset<T> l, const set<T>& r) {
    set<T> l_copy = l;
    for (auto i : r) { l_copy.insert(i); }
    return l_copy;
}
string operator+(const string l, const string& r) {
    string str = l;
    str += r;
    return str;
}
string operator*(const string l, const size_t& r) {
    string str = l;
    for (size_t i = 0; i < r; i++) { str += l; }
    return str;
}
#pragma endregion overload
#pragma region Input
template <class Head>
void INPUT(vector<Head>& head);
template <size_t N, class Head>
void INPUT(array<Head, N>& head);
template <class T1>
void INPUT(tuple<T1>& t);
template <class T1, class T2>
void INPUT(tuple<T1, T2>& t);
template <class T1, class T2, class T3>
void INPUT(tuple<T1, T2, T3>& t);
template <class T1, class T2, class T3, class T4>
void INPUT(tuple<T1, T2, T3, T4>& t);
template <class T1, class T2, class T3, class T4, class T5>
void INPUT(tuple<T1, T2, T3, T4, T5>& t);
template <class Head>
void INPUT(Head& head);
template <class Head, class... Tail>
void INPUT(Head& head, Tail&... tail);
//本体
template <class Head>
void INPUT(vector<Head>& head) {
    for (size_t i = 0; i < head.size(); i++) { INPUT(head[i]); }
}
template <size_t N, class Head>
void INPUT(array<Head, N>& head) {
    for (size_t i = 0; i < head.size(); i++) { INPUT(head[i]); }
}
template <class T1>
void INPUT(tuple<T1>& t) {
    cin >> get<0>(t);
}
template <class T1, class T2>
void INPUT(tuple<T1, T2>& t) {
    cin >> get<0>(t) >> get<1>(t);
}
template <class T1, class T2, class T3>
void INPUT(tuple<T1, T2, T3>& t) {
    cin >> get<0>(t) >> get<1>(t) >> get<2>(t);
}
template <class T1, class T2, class T3, class T4>
void INPUT(tuple<T1, T2, T3, T4>& t) {
    cin >> get<0>(t) >> get<1>(t) >> get<2>(t) >> get<3>(t);
}
template <class T1, class T2, class T3, class T4, class T5>
void INPUT(tuple<T1, T2, T3, T4, T5>& t) {
    cin >> get<0>(t) >> get<1>(t) >> get<2>(t) >> get<3>(t) >> get<4>(t);
}
template <class Head>
void INPUT(Head& head) {
    cin >> head;
}
template <class Head, class... Tail>
void INPUT(Head& head, Tail&... tail) {
    INPUT(head);
    INPUT((tail)...);
}
#pragma endregion Input
#pragma region Print
template <class T1>
void PRINT2(tuple<T1> t);
template <class T1, class T2>
void PRINT2(tuple<T1, T2> t);
template <class T1, class T2, class T3>
void PRINT2(tuple<T1, T2, T3> t);
template <class T1, class T2, class T3, class T4>
void PRINT2(tuple<T1, T2, T3, T4> t);
template <class T1, class T2, class T3, class T4, class T5>
void PRINT2(tuple<T1, T2, T3, T4, T5> t);
template <class Head>
void PRINT2(vector<Head> head);
template <class Head>
void PRINT2(vector<vector<Head>> head);
template <size_t N, class Head>
void PRINT2(vector<array<Head, N>> head);
template <class... Head>
void PRINT2(vector<tuple<Head...>> head);
template <size_t N, class Head>
void PRINT2(array<Head, N> head);
template <class Head>
void PRINT2(Head head);
template <class Head, class... Tail>
void PRINT2(Head head, Tail... tail);
template <class Head>
void PRINT(Head head);
template <class... Head>
void PRINT(Head... head);
template <int N, class Head>
void PRINT(Head head);
template <class T1>
void PRINT2(tuple<T1> t) {
    PRINT2(get<0>(t));
}
template <class T1, class T2>
void PRINT2(tuple<T1, T2> t) {
    PRINT2(get<0>(t), get<1>(t));
}
template <class T1, class T2, class T3>
void PRINT2(tuple<T1, T2, T3> t) {
    PRINT2(get<0>(t), get<1>(t), get<2>(t));
}
template <class T1, class T2, class T3, class T4>
void PRINT2(tuple<T1, T2, T3, T4> t) {
    PRINT2(get<0>(t), get<1>(t), get<2>(t), get<3>(t));
}
template <class T1, class T2, class T3, class T4, class T5>
void PRINT2(tuple<T1, T2, T3, T4, T5> t) {
    PRINT2(get<0>(t), get<1>(t), get<2>(t), get<3>(t), get<4>(t));
}
template <class Head>
void PRINT2(vector<Head> head) {
    for (auto i = head.begin(); i != head.end(); i++) {
        PRINT2(*i);
        if (i != head.end() - 1) { cout << " "; }
    }
}
template <class Head>
void PRINT2(vector<vector<Head>> head) {
    for (auto i = head.begin(); i != head.end(); i++) {
        PRINT2(*i);
        if (i != head.end() - 1) { cout << endl; }
    }
}
template <size_t N, class Head>
void PRINT2(vector<array<Head, N>> head) {
    for (auto i = head.begin(); i != head.end(); i++) {
        PRINT2(*i);
        if (i != head.end() - 1) { cout << endl; }
    }
}
template <class... Head>
void PRINT2(vector<tuple<Head...>> head) {
    for (auto i = head.begin(); i != head.end(); i++) {
        PRINT2(*i);
        if (i != head.end() - 1) { cout << endl; }
    }
}
template <size_t N, class Head>
void PRINT2(array<Head, N> head) {
    for (auto i = head.begin(); i != head.end(); i++) {
        PRINT2(*i);
        if (i != head.end() - 1) { cout << " "; }
    }
}
template <class Head>
void PRINT2(Head head) {
    cout << head;
}
template <class Head, class... Tail>
void PRINT2(Head head, Tail... tail) {
    PRINT2(head);
    cout << " ";
    PRINT2((tail)...);
}
template <class Head>
void PRINT(Head head) {
    PRINT2(head);
    cout << endl;
}
template <class... Head>
void PRINT(Head... head) {
    PRINT2((head)...);
    cout << endl;
}
template <int N, class Head>
void PRINT(Head head) {
    PRINT2(head);
    cout << endl;
}
#pragma endregion Print
#pragma endregion Macro

// 頂点の数、辺の情報(始点、終点、辺容量、コスト)、indexed
template <class num_type>
struct min_cost_flow {
    int n;
    num_type inf = pow(10, 8);
    vector<vector<tuple<int, num_type, num_type>>> g_temp;

    min_cost_flow(int& t1, vector<tuple<int, int, num_type, num_type>>& t2,
                  int indexed) {
        int u, v;
        num_type w, c;
        n = t1;
        g_temp.resize(n);
        for (tuple<int, int, num_type, num_type> t3 : t2) {
            tie(u, v, w, c) = t3;
            add_edge(u - indexed, v - indexed, w, c);
        }
    }
    void add_edge(int From, int to, num_type& cap, num_type& cost) {
        g_temp[From].push_back(make_tuple(to, cap, cost));
        g_temp[to].push_back(make_tuple(From, 0, -cost));
    }
    num_type bellman_ford(vector<vector<tuple<int, num_type, num_type>>>& g,
                          int& s, int& t, num_type& flow) {
        vector<num_type> dist(n, inf);
        vector<tuple<int, num_type>> prev(n, make_tuple(-1, 0));
        dist[s] = 0;
        int To, now = t, next;
        num_type cap, cost, m = inf;
        for (int i = 0; i < n; i++) {
            for (int From = 0; From < n; From++) {
                for (tuple<int, num_type, num_type> t1 : g[From]) {
                    tie(To, cap, cost) = t1;
                    if (cap) {
                        if (dist[To] > dist[From] + cost) {
                            dist[To] = dist[From] + cost;
                            prev[To] = make_tuple(From, cap);
                        }
                    }
                }
            }
        }
        while (now != s) {
            if (get<0>(prev[now]) == -1) {
                return -inf;
            } else {
                m = min(m, get<1>(prev[now]));
                now = get<0>(prev[now]);
            }
        }
        m = min(m, flow);
        now = t;
        while (now != s) {
            next = get<0>(prev[now]);
            int gnext = (int)g[next].size(), gnow = (int)g[now].size();
            for (int i = 0; i < gnext; i++) {
                tie(To, cap, cost) = g[next][i];
                if (To == now) {
                    g[next][i] = make_tuple(To, cap - m, cost);
                    break;
                }
            }
            for (int i = 0; i < gnow; i++) {
                tie(To, cap, cost) = g[now][i];
                if (To == next) {
                    g[now][i] = make_tuple(To, cap + m, cost);
                    break;
                }
            }
            now = next;
        }
        flow -= m;
        return dist[t] * m;
    }
    // 最小費用流を計算する
    num_type calc_flow(int s, int t, num_type flow) {
        num_type ans = 0;
        vector<vector<tuple<int, num_type, num_type>>> g = g_temp;
        while (flow) {
            num_type ret = bellman_ford(g, s, t, flow);
            if (ret == -inf) {
                return -1;
            } else {
                ans += ret;
            }
        }
        return ans;
    }
};

int main() {
    PRE_COMMAND
    int n, m;
    ll f;
    INPUT(n, m, f);
    vector<tuple<int, int, ll, ll>> abcd(m);
    INPUT(abcd);
    min_cost_flow<ll> flow(n, abcd, 0);
    PRINT(flow.calc_flow(0, n - 1, f));
}


Measured memory_bytes: 3256