#include <fstream>
#include <algorithm>
#include <vector>
#include <cstring>
using namespace std;

ifstream cin("plus.in");
ofstream cout("plus.out");

int main() {
    long long s, x1, y1, x2, y2, x3, y3;
    cin >> s >> x1 >> y1 >> x2 >> y2 >> x3 >> y3;
    long long max2 = max(x2 * y2, (long long)0);
    long long max3 = max(x3 * y3, (long long)0);
    long long min2 = min(x2 * y2, (long long)0);
    long long min3 = min(x3 * y3, (long long)0);
    long long answer = 0;
    for (long long i = 0; i <= x1; i++) {
        if (y2 == 0) {
            if (y3 == 0 && s == 0)
                answer = answer + (x2 + 1) * (x3 + 1);
            else
                if (y3 != 0) {
                    if (s / y3 <= x3 && s / y3 >= 0)
                        answer = answer + x2 + 1;
                }
        }
        else
            if (y3 == 0) {
                if (s / y2 <= x2 && s / y2 >= 00)
                    answer = answer + x3 + 1;
            }
            else
                answer = answer + max((long long)0, min(s - min2, max3) - max(s - max2, min3) + 1);
        s -= y1;
    }
    cout << answer << "\n";
    return 0;
}