#include <iostream>
#include <fstream>
#include <iomanip>
#include <climits>
#include <limits>
#include <algorithm>
#include <array>
#include <vector>
#include <deque>
#include <queue>
#include <list>
#include <stack>
#include <string>
#include <functional>
#include <numeric>
#include <map>
#include <set>
#include <cstdlib>
#include <bitset>
#include <unordered_map>
#include <random>
#include <cmath>
#include <complex>
// #include "utiltime.hpp"

using namespace std;

typedef long long int ll;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef pair<int, int> P;
typedef pair<ll, ll> Pll;
typedef vector<ll> vll;
typedef vector<vector<ll>> vvll;
typedef complex<double> cdouble;

const int INFL = (int)1e9;
const ll INFLL = (ll)1e18;
const double INFD = numeric_limits<double>::infinity();
const double PI = 3.14159265358979323846;
#define Loop(i, n) for(int i = 0; i < (int)n; i++)
#define Loopll(i, n) for(ll i = 0; i < (ll)n; i++)
#define Loop1(i, n) for(int i = 1; i <= (int)n; i++)
#define Loopll1(i, n) for(ll i = 1; i <= (ll)n; i++)
#define Loopr(i, n) for(int i = (int)n - 1; i >= 0; i--)
#define Looprll(i, n) for(ll i = (ll)n - 1; i >= 0; i--)
#define Loopr1(i, n) for(int i = (int)n; i >= 1; i--)
#define Looprll1(i, n) for(ll i = (ll)n; i >= 1; i--)
#define Foreach(buf, container) for(auto buf : container)
#define Loopdiag(i, j, h, w, sum) for(int i = ((sum) >= h ? h - 1 : (sum)), j = (sum) - i; i >= 0 && j < w; i--, j++)
#define Loopdiagr(i, j, h, w, sum) for(int j = ((sum) >= w ? w - 1 : (sum)), i = (sum) - j; j >= 0 && i < h; j--, i++)
#define Loopdiagsym(i, j, h, w, gap) for (int i = ((gap) >= 0 ? (gap) : 0), j = i - (gap); i < (h) && j < (w); i++, j++)
#define Loopdiagsymr(i, j, h, w, gap) for (int i = ((gap) > (h) - (w) - 1 ? (h) - 1 : (w) - 1 + (gap)), j = i - (gap); i >= 0 && j >= 0; i--, j--)
#define Loopitr(itr, container) for(auto itr = container.begin(); itr != container.end(); itr++)
#define printv(vector) Loop(extra_i, vector.size()) { cout << vector[extra_i] << " "; } cout << endl;
#define printmx(matrix) Loop(extra_i, matrix.size()) { Loop(extra_j, matrix[extra_i].size()) { cout << matrix[extra_i][extra_j] << " "; } cout << endl; }
#define quickio() ios::sync_with_stdio(false); cin.tie(0);
#define readfile(filename) ifstream in(filename); cin.rdbuf(in.rdbuf());
#define bitmanip(m,val) static_cast<bitset<(int)m>>(val)
bool nearlyeq(double x, double y) { return abs(x - y) < 1e-9; }
bool inrange(int x, int t) { return x >= 0 && x < t; }
ll rndf(double x) { return (ll)(x + (x >= 0 ? 0.5 : -0.5)); }
ll floorsqrt(double x) { ll m = (ll)sqrt(x); return m + (m * m <= (ll)(x) ? 0 : -1); }
ll ceilsqrt(double x) { ll m = (ll)sqrt(x); return m + ((ll)x <= m * m ? 0 : 1); }
ll rnddiv(ll a, ll b) { return (a / b + (a % b * 2 >= b ? 1 : 0)); }
ll ceildiv(ll a, ll b) { return (a / b + (a % b == 0 ? 0 : 1)); }
ll gcd(ll m, ll n) { if (n == 0) return m; else return gcd(n, m % n); }

/*******************************************************/

typedef ll val_t;

struct graph_t {
	int n;           // |V|, index begins with 0
	int m;           // |E|
	vector<P> edges; // E
	vector<val_t> vals; // V
	vector<ll> costs; // cost or distance
	vector<ll> caps;  // capacity
};

class Mincostflow {
private:
	struct edge {
		int eid, from, to;
		ll cap, cost;
	};
	struct node {
		int id; ll d; int from_eid; vector<int> to_eids;
	};
	struct pq_t {
		int id; ll d;
		bool operator<(const pq_t & another) const {
			return d != another.d ? d > another.d : id > another.id;
		}
	};
	int dual_eid(int eid) {
		if (eid < m) return eid + m;
		else return eid - m;
	}
	vector<node> nodes;
	vector<edge> edges;
	int n, m;
	int source, sink;
	bool overflow;
public:
	Mincostflow(graph_t G, int s, int t) {
		n = G.n;
		m = int(G.edges.size());
		nodes.resize(n);
		edges.resize(m * 2);
		Loop(i, n) nodes[i] = { i, LLONG_MAX, -1, {} };
		Loop(i, m) {
			int a = G.edges[i].first;
			int b = G.edges[i].second;
			nodes[a].to_eids.push_back(i);
			nodes[b].to_eids.push_back(i + m);
			edges[i] = { i, a, b, G.caps[i], G.costs[i] };
			edges[i + m] = { i + m, b, a, 0, -G.costs[i] };
		}
		source = s;
		sink = t;
		overflow = false;
	}
	bool add_flow(ll f) {
		if (overflow) return false;
		while (f > 0) {
			Loop(i, n) {
				nodes[i].d = LLONG_MAX;
				nodes[i].from_eid = -1;
			}
			// Bellmanford
			nodes[source].d = 0;
			Loop(k, n) {
				Loop(i, n) {
					int a = i;
					if (nodes[a].d == LLONG_MAX) continue;
					Foreach(eid, nodes[a].to_eids) {
						if (edges[eid].cap == 0) continue;
						int b = edges[eid].to;
						if (nodes[a].d + edges[eid].cost < nodes[b].d) {
							nodes[b].d = nodes[a].d + edges[eid].cost;
							nodes[b].from_eid = eid;
							if (k == n - 1) {
								return false;
							}
						}
					}
				}
			}
			if (nodes[sink].d == LLONG_MAX) return false;
			int a = sink;
			ll df = f;
			while (a != source) {
				df = min(df, edges[nodes[a].from_eid].cap);
				a = edges[nodes[a].from_eid].from;
			}
			a = sink;
			while (a != source) {
				edges[nodes[a].from_eid].cap -= df;
				edges[dual_eid(nodes[a].from_eid)].cap += df;
				a = edges[nodes[a].from_eid].from;
			}
			f -= df;
		}
		return true;
	}
	vll get_eid_flow() {
		vll ret(m, -1);
		if (overflow) return ret;
		Loop(i, m) {
			ret[i] = edges[i + m].cap;
		}
		return ret;
	}
	ll get_flow() {
		if (overflow) return -1;
		ll ret = 0;
		Foreach(eid, nodes[sink].to_eids) {
			if (eid >= m) ret += edges[eid].cap;
		}
		return ret;
	}
	ll get_cost() {
		if (overflow) return -1;
		ll ret = 0;
		Loop(i, m) {
			ret += edges[i].cost * edges[i + m].cap;
		}
		return ret;
	}
};

int main() {
	graph_t G; cin >> G.n; cin >> G.m;
	ll f; cin >> f;
	Loop(i, G.m) {
		int s, t; cin >> s >> t;
		ll cap, cost; cin >> cap >> cost;
		G.edges.push_back({ s, t });
		G.caps.push_back(cap);
		G.costs.push_back(cost);
	}
	Mincostflow mcf(G, 0, G.n - 1);
	if (mcf.add_flow(f)) cout << mcf.get_cost() << endl;
	else cout << -1 << endl;
}


Measured memory_bytes: 3264