#include<iostream>

#include<vector>

using namespace std;

int main() {

int n, m;

cin >> n >> m;

int a, b, c, d;

cin >> a >> b >> c >> d;

int x, y, z;

cin >> x >> y >> z;

vector<vector<int>>mark(n + 1, vector<int>(m + 1, -1));

mark[n][m] = 0;

for(int i=n;i>=0;--i)

for (int j = m; j >=0; --j) {

if (mark[i][j] != -1) {

if (i >= a&&j >= b)

mark[i - a][j - b] = mark[i][j] + x;

if (j >= c)

mark[i][j - c] = mark[i][j] + y;

if (i >= d)

mark[i - d][j] = mark[i][j] + z;

}

}

int result = 0;

for (int i = 0; i <= n; ++i)

for (int j = 0; j <= m; ++j)

if (mark[i][j] > result)

result = mark[i][j];

cout << result;

}