N, M, W = map(int, input().split())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
C = list(map(int, input().split()))
D = list(map(int, input().split()))

dp = [-1] * (W + 1)
dp[0] = 0

for i in range(N):
    for w in range(W - A[i] + 1):
        if dp[w] != -1:
            dp[w + A[i]] = max(dp[w + A[i]], dp[w] + B[i])

for i in range(M):
    for w in range(W, C[i] - 1, -1):
        if dp[w] != -1:
            dp[w - C[i]] = max(dp[w - C[i]], dp[w] - D[i])

print(max(dp))