#include <stdio.h>

int memo[50][301],done[50][301];
int N,C,V,S[1500],T[1500],Y[1500],M[1500];
	
int min(int a,int b){
	if(a>b){return b;}else{return a;}
}

int dp(int a,int b){
	int i,an;
	if(done[a][b]==1){return memo[a][b];}
	an = 100000000;
	for(i=0;i<=V;i++){
		if(S[i] == a+1 && b-Y[i]>=0){
			an = min(an, M[i]+dp(T[i]-1,b-Y[i]));
		}
	}
	memo[a][b] = an;

	done[a][b] = 1;
	return memo[a][b];
}

int main(void){
	int i,j;

	scanf("%d %d %d",&N,&C,&V);
	for(i=0;i<V;i++){
		scanf("%d",&S[i]);
	}
	for(i=0;i<V;i++){
		scanf("%d",&T[i]);
	}
	for(i=0;i<V;i++){
		scanf("%d",&Y[i]);
	}
	for(i=0;i<V;i++){
		scanf("%d",&M[i]);
	}

	for(i=0;i<N;i++){
		for(j=0;j<=C;j++){
			done[i][j] = 0;
		}
	}

	for(i=0;i<=C;i++){
		done[N-1][i] = 1;
		memo[N-1][i] = 0;
	}
	
	if(dp(0,C)<100000000){
		printf("%d\n",dp(0,C));
	}else{
		printf("-1\n");
	}
}