#include <bits/stdc++.h>
using namespace std;
const int N = 3000;
long long express[N];
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
long long n, m, k, a, b, c, t;
cin >> n >> m >> k >> a >> b >> c >> t;
for (int i = 0; i < m; ++i) {
cin >> express[i];
--express[i];
}
long long ans = -1;
vector<long long> semiexpress;
for (int i = 0; i < m - 1; ++i) {
long long x = express[i];
for (int j = 0; j <= k - m; ++j) {
if (x == express[i + 1] || b * express[i] + c * (x - express[i]) > t) {
break;
}
long long remain = t - b * express[i] - c * (x - express[i]);
long long y = min(express[i + 1], x + remain / a + 1);
if (x == express[i]) {
ans += y - x;
} else {
semiexpress.push_back(y - x);
}
x = y;
}
}
ans += b * express[m - 1] <= t;
sort(semiexpress.rbegin(), semiexpress.rend());
for (int i = 0; i < k - m && i < (int) semiexpress.size(); ++i) {
ans += semiexpress[i];
}
cout << ans << "\n";
}
