#include <iostream>
#include <vector>

int main() {
    using namespace std;
    int v0, v1, v2, v3;
    cin >> v0 >> v1 >> v2 >> v3;

    auto solve = [&](int a, int b, int c, int v) -> int {
        int res = 200;
        for (int i = 0; a * i <= v; i++) {
            for (int j = 0; a * i + b * j <= v; j++) {
                int k = (v - a * i - b * j) / c;
                if (a * i + b * j + c * k == v) { res = min(res, i + j + k); }
            }
        }
        return res;
    };

    int ans = 200;
    constexpr int m = 30;
    for (int a = 1; a <= m; a++) {
        for (int b = a + 1; b <= m; b++) {
            for (int c = b + 1; c <= m; c++) {
                ans = min(
                    ans,
                    solve(a, b, c, v0) +
                    solve(a, b, c, v1) +
                    solve(a, b, c, v2) +
                    solve(a, b, c, v3)
                );
            }
        }
    }
    cout << ans << endl;
}