import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) {
	      BufferedReader stdReader =new BufferedReader(new InputStreamReader(System.in));
	      try {
	    	  int N = Integer.parseInt(stdReader.readLine());
	    	  int C = Integer.parseInt(stdReader.readLine());
	    	  int V = Integer.parseInt(stdReader.readLine());
	    	  String[] temp1 = stdReader.readLine().split(" ");
	    	  String[] temp2 = stdReader.readLine().split(" ");
	    	  String[] temp3 = stdReader.readLine().split(" ");
	    	  String[] temp4 = stdReader.readLine().split(" ");
	    	  int[] S = new int[V+1];
	    	  int[] T = new int[V+1];
	    	  int[] Y = new int[V+1];
	    	  int[] M = new int[V+1];
	    	  
	    	  for(int i=1;i<V+1;i++){
	    		  S[i] = Integer.parseInt(temp1[i-1]);
	    		  T[i] = Integer.parseInt(temp2[i-1]);
	    		  Y[i] = Integer.parseInt(temp3[i-1]);
	    		  M[i] = Integer.parseInt(temp4[i-1]);
	    	  }
	    	  
	    	  int[][] cost = new int[N+1][N+1];
	    	  int[][] money = new int[N+1][N+1];
	    	  
	    	  for(int i=1;i<V+1;i++){
	    		  cost[S[i]][T[i]] = Y[i];
	    		  money[S[i]][T[i]] = M[i];
	    	  }
	    	  
	    	  int[] costDP = new int[N+1];
	    	  int[] moneyDP = new int[N+1];
	    	  moneyDP[0] = 0;
	    	  
	    	  for(int i=1;i<N+1;i++){
	    		  for(int j=i-1;j>=1;j--){
	    			  if(money[i-j][i]!=0){
	    				  if((i-j) != 1){
		    				  if(moneyDP[i-j]!=0 && (moneyDP[i] == 0 || moneyDP[i]>moneyDP[i-j]+money[i-j][i])){
		    					  if(costDP[i-j]+cost[i-j][i]<=C){
		    						  moneyDP[i] = moneyDP[i-j]+money[i-j][i];
		    						  costDP[i] = costDP[i-j]+cost[i-j][i];
		    					  }
		    				  }
	    				  }else{
	    					  if(costDP[i-j]+cost[i-j][i]<=C){
	    						  moneyDP[i] = moneyDP[i-j]+money[i-j][i];
	    						  costDP[i] = costDP[i-j]+cost[i-j][i];
	    					  }
	    				  }
	    			  }
	    		  }
	    	  }    	  
	    	  System.out.println(moneyDP[N]!=0?moneyDP[N]:-1);
	      } catch (IOException e) {
			e.printStackTrace();
	      }
	}
}