#include <iostream>
#include <vector>
using namespace std;
int main()
{
    int N, M, W;
    cin >> N >> M >> W;
    int n = N + M;
    int wei[20];
    int val[20];
    for (int i = 0; i < N; i++) {
        cin >> wei[i] >> val[i];
    }
    for (int i = N; i < N + M; i++) {
        cin >> wei[i] >> val[i];
        wei[i] *= -1;
        val[i] *= -1;
    }
    int inf = 1e9 + 7;
    vector<vector<int>> dp(1 << n, vector<int>(W + 1, -inf));
    dp[0][0] = 0;
    for (int i = 1; i < (1 << n); i++) {
        for (int j = 0; j < n; j++) {
            if ((i >> j) & 1) {
                for (int k = 0; k <= W; k++) {
                    dp[i][k] = max(dp[i][k], dp[i - (1 << j)][k]);
                }
                for (int k = max(0, -wei[j]); k <= min(W, W - wei[j]); k++) {
                    dp[i][k + wei[j]] = max(dp[i][k + wei[j]], dp[i - (1 << j)][k] + val[j]);
                }
            }
        }
    }
    int ans = 0;
    for (int i = 0; i <= W; i++) {
        ans = max(ans, dp[(1 << n) - 1][i]);
    }
    cout << ans << endl;
}