N=int(raw_input())
C=int(raw_input())
V=int(raw_input())
S=map(int,raw_input().split())
T=map(int,raw_input().split())
Y=map(int,raw_input().split())
M=map(int,raw_input().split())
edge=[]
for i in xrange(V):
  edge.append((S[i]-1,T[i]-1,Y[i], M[i]))
edge=sorted(edge)
dp=[[10**9]*(C+1) for _ in xrange(N)]
dp[0][C]=0

for e in edge:
  for j in xrange(C+1):
    if j+e[2]>C: continue
    dp[e[1]][j] = min(dp[e[1]][j], dp[e[0]][j+e[2]]+e[3])

ans = 10**9
for i in xrange(C+1):
  ans = min(ans, dp[N-1][i])
if ans==10**9: print -1
else: print ans