#include <iostream>
#include <vector>
#include <string>

void solve() {
    std::vector<int> xs(3);
    for (auto& x : xs) std::cin >> x;

    std::vector<int> ys(3);
    {
        std::string s;
        std::cin >> s;

        for (char c : s) {
            for (int i = 0; i < 3; ++i) {
                if (c == "GCP"[i]) ++ys[i];
            }
        }
    }

    int ans = 0;

    for (int i = 0; i < 3; ++i) {
        int j = (i + 1) % 3;
        int g = std::min(xs[i], ys[j]);

        ans += g * 3;
        xs[i] -= g, ys[j] -= g;
    }

    for (int i = 0; i < 3; ++i) {
        int j = i;
        int g = std::min(xs[i], ys[j]);

        ans += g * 1;
        xs[i] -= g, ys[j] -= g;
    }

    std::cout << ans << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}