#include <iostream>
#include <vector>
#include <algorithm>
#include <climits>
using namespace std;

long long solve() {
    int N, D, K;
    cin >> N >> D >> K;
    vector<int> A(N), C(N);
    for (int i = 0; i < N; i++) cin >> A[i];
    for (int i = 0; i < N; i++) cin >> C[i];

    const long long INF = LLONG_MIN/10;
    vector<vector<long long>> dp(D + 1, vector<long long>(K + 1, INF));
    dp[0][0] = 0;

    for (int i = 0; i < N; i++) {
        vector<vector<long long>> ndp(D + 1, vector<long long>(K + 1, INF));
        for (int d = 0; d <= D; d++) {
            for (int k = 0; k <= K; k++) {
                ndp[d][k] = dp[d][k]; // 配列のコピー
            }
        }

        int a = A[i];
        int c = C[i];

        for (int d = 0; d + 1 <= D; d++) {
            for (int k = 0; k <= K; k++) {
                int nk = min(K, k + c);
                ndp[d + 1][nk] = max(ndp[d + 1][nk], dp[d][k] + a);
            }
        }

        dp = ndp;
    }

    sort(C.begin(), C.end());
    long long csum = 0;
    for (int i = N - D; i < N; i++) {
        csum += C[i];
    }
    if (csum < K) {
        return false;
    }

    return dp[D][K];
}

int main() {
    cout << solve() << endl;
    return 0;
}