using System;
using System.Collections.Generic;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;
using static System.Math;
using System.Numerics;
static class Program{
	const int mod=(int)1e9+7;
	static void Main(){
		Sc sc=new Sc();
		var s=sc.Ia;
		var fl=new Mcfp(s[0],s[1]);
		for(int i = 0;i<s[1];i++) {
			var e=sc.Ia;
			fl.Edge(e[0],e[1],e[2],e[3]);
		}
		Console.WriteLine("{0}",fl.Pd(0,s[0]-1,s[2]));
	}
}
public class Mcfp{
	private List<int>[] li;
	private int[][] h,pt;
	private int[] z,l,r,u;
	private bool[] b1,b2;
	private int n,p=0;
	private const int inf=int.MaxValue;
	public Mcfp(int n,int m){
		this.n=n;
		m<<=1;
		li=new List<int>[n];
		z=new int[n];
		l=new int[n];
		r=new int[n];
		u=new int[n];
		h=new int[m][];
		for(int i=0;i<n;i++){
			li[i]=new List<int>();
			z[i]=int.MaxValue;
		}
	}
	public void Edge(int a,int b,int e,int c){
		if(a==b){return;}
		li[a].Add(p);
		li[b].Add(p+1);
		h[p]=new int[]{b,e,c};
		h[p+1]=new int[]{a,0,-c};
		p+=2;
	}
	public long Pd(int s,int t,int c){
		long ans=0;
		pt=new int[][]{new int[n],new int[n]};
		int k=0,d=0;
		while(c>d){
			b1=new bool[n];
			b2=new bool[n];
			u=new int[n];
			var pq=new Pq<Mo<int>>(32,true);
			z[0]=0;
			l[0]=-1;
			u[0]=int.MaxValue;
			b2[0]=true;
			pq.Push(new Mo<int>(s,0));
			bool bo=false;
			while(pq.cnt>0){
				var e=pq.Top;
				pq.Pop();
				if(b1[e.d]){continue;}
				b1[e.d]=true;
				if(e.d==t){bo=true;}
				for(int i=0;i<li[e.d].Count;i++){
					if(h[li[e.d][i]][1]==0){continue;}
					int co=e.n+h[li[e.d][i]][2]-pt[k^1][h[li[e.d][i]][0]]+pt[k^1][e.d];
					if(!b2[h[li[e.d][i]][0]]||z[h[li[e.d][i]][0]]>co){
						b2[h[li[e.d][i]][0]]=true;
						z[h[li[e.d][i]][0]]=co;
						pt[k][h[li[e.d][i]][0]]=pt[k^1][h[li[e.d][i]][0]]+co;
						l[h[li[e.d][i]][0]]=e.d;
						r[h[li[e.d][i]][0]]=li[e.d][i];
						u[h[li[e.d][i]][0]]=Min(u[e.d],h[li[e.d][i]][1]);
						pq.Push(new Mo<int>(z[h[li[e.d][i]][0]],h[li[e.d][i]][0]));
					}
					else if(z[h[li[e.d][i]][0]]==co){
						var o=Min(u[e.d],h[li[e.d][i]][1]);
						if(u[h[li[e.d][i]][0]]<o){
							u[h[li[e.d][i]][0]]=o;
							l[h[li[e.d][i]][0]]=e.d;
							r[h[li[e.d][i]][0]]=li[e.d][i];
						}
					}
				}
			}
			if(!bo){break;}
			u[t]=Min(c-d,u[t]);
			for(int i = t;i!=s;i=l[i]) {
				ans+=u[t]*h[r[i]][2];
				h[r[i]][1]-=u[t];
				h[r[i]^1][1]+=u[t];
			}
			k^=1;
			d+=u[t];
		}
		return c==d?ans:-1;
	}
}
public class Mo<T>:IComparable{
	public int n;
	public T d;
	public Mo(int n,T d){this.n=n;this.d=d;}
	public int CompareTo(object obj){
		Mo<T> mymo=(Mo<T>)obj;
		if(mymo.n>n){return -1;}
		else if(mymo.n<n){return 1;}
		else{return 0;}
	}
}
public class Pq<T> where T:IComparable{
	private T[] he;
	public int cnt=0,max=0;
	private Func<T,T,int> compare;
	public Pq(int max,bool mm){
		this.max=max;
		he=new T[max];
		if(mm){compare=Ao;}
		else{compare=Do;}
	}
	public void Push(T x){
		if(cnt==max){Extend();}
		int j=cnt;
		while(j!=0&&compare(x,he[(j-1)>>1])>0){he[j]=he[(j-1)>>1];j=(j-1)>>1;}
		he[j]=x;
		cnt++;
	}
	public void Pop(){
		cnt--;
		T r=he[cnt];
		int j=0;
		while(true){
			if(j*2+1<cnt){
				if(compare(he[j*2+1],he[j*2+2])>0){j=j*2+1;}
				else{j=j*2+2;}
			}
			else if(j*2<cnt){j=j*2+1;}
			else{break;}
			if(compare(he[j],r)<=0){j=(j-1)>>1;break;}
			he[(j-1)>>1]=he[j];
		}
		he[j]=r;
	}
	private int Ao(T x,T y){return y.CompareTo(x);}
	private int Do(T x,T y){return x.CompareTo(y);}
	public T Top{get{return he[0];}}
	private void Extend(){
		T[] nhe=new T[max<<1];
		Array.Copy(he,nhe,max);
		he=nhe;
		max<<=1;
	}
}

public class Sc{
	public int I{get{return int.Parse(Console.ReadLine());}}
	public long L{get{return long.Parse(Console.ReadLine());}}
	public double D{get{return double.Parse(Console.ReadLine());}}
	public string S{get{return Console.ReadLine();}}
	public int[] Ia{get{return Array.ConvertAll(Console.ReadLine().Split(),int.Parse);}}
	public long[] La{get{return Array.ConvertAll(Console.ReadLine().Split(),long.Parse);}}
	public double[] Da{get{return Array.ConvertAll(Console.ReadLine().Split(),double.Parse);}}
	public string[] Sa{get{return Console.ReadLine().Split();}}
	public object[] Oa{get{return Console.ReadLine().Split();}}
	public int[] Ia2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),int.Parse);}}
	public int[] Ia3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),int.Parse);}
	public int[] Ia3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),int.Parse);}
	public long[] La2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),long.Parse);}}
	public long[] La3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),long.Parse);}
	public long[] La3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),long.Parse);}
	public T[] Arr<T>(int n,Func<T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f();}return a;}
	public T[] Arr<T>(int n,Func<int,T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i);}return a;}
	public T[] Arr<T>(int n,Func<string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(Console.ReadLine().Split());}return a;}
	public T[] Arr<T>(int n,Func<int,string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i,Console.ReadLine().Split());}return a;}
}


Measured memory_bytes: 18288