#include <iostream>
#include <algorithm>

using namespace std;

int main() {
    float a[3][2], n, b[3], c[3], k;
    cin >> n;
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 2; j++) {
            cin >> a[i][j];
        }
    }
    for (int i = 0; i < 3; i++) {
        k = n / a[i][0];
        if (k >= 1) {
            b[i] = (int)k + 1;
        } else {
            b[i] = k;
        }
        c[i] = b[i] * a[i][1];
    }
    sort(c, c + 3);
    cout << c[2];
    return 0;
}