// No.161 制限ジャンケン
// https://yukicoder.me/problems/no/161
//

#include <iostream>
#include <vector>
using namespace std;

int solve(vector<int> &yuki, string &s);


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

    vector<int> yuki(3);
    for (int i = 0; i < 3; ++i)
        cin >> yuki[i];
    string s;
    cin >> s;
    int ans = solve(yuki, s);
    cout << ans << endl;
}

int solve(vector<int> &yuki, string &s) {
    const int G = 0;
    const int C = 1;
    const int P = 2;

    vector<int> fri(3, 0);
    for (char c: s) {
        if (c == 'G')
            ++fri[G];
        else if (c == 'C')
            ++fri[C];
        if (c == 'P')
            ++fri[P];
    }

    int ans = 0;
    // 勝ちによるポイント
    int g_win = min(yuki[G], fri[C]);
    int c_win = min(yuki[C], fri[P]);
    int p_win = min(yuki[P], fri[G]);
    yuki[G] -= g_win;
    yuki[C] -= c_win;
    yuki[P] -= p_win;
    fri[C] -= g_win;
    fri[P] -= c_win;
    fri[G] -= p_win;
    ans += (g_win + c_win + p_win) * 3;

    // 引き分けによるポイント
    int g_draw = min(yuki[G], fri[G]);
    int c_draw = min(yuki[C], fri[C]);
    int p_draw = min(yuki[P], fri[P]);
    ans += (g_draw + c_draw + p_draw);

    return ans;
}