INF = 1<<32
N = int(input())
C = int(input())
V = int(input())
S = list(map(int,input().split()))
T = list(map(int,input().split()))
Y = list(map(int,input().split()))
M = list(map(int,input().split()))
G = [[] for _ in range(N)]
for i in range(V):
    G[S[i]-1].append((T[i]-1, Y[i], M[i]))
DP = [[INF] * (C+1) for _ in range(N)]
DP[0][0] = 0
for pos in range(N):
    for pre,yen,minute in G[pos]:
        for i in range(C):
            if i + yen <= C:
                DP[pre][i+yen] = min(DP[pre][i+yen], DP[pos][i] + minute)
    for i in range(C):
        DP[pos][i+1] = min(DP[pos][i], DP[pos][i+1])
if DP[-1][-1] == INF:
    print(-1)
else:
    print(DP[-1][-1])