using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static string InputPattern = "Input4";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("2 1 1");
            WillReturn.Add("CCGP");
            //12
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("0 0 5");
            WillReturn.Add("CCCCC");
            //0
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("7 6 5");
            WillReturn.Add("GCPGPCPGGGPCCCGPGP");
            //50
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    //No.161 制限ジャンケン
    static void Main()
    {
        List<string> InputList = GetInputList();
        int[] wkArr = InputList[0].Split(' ').Select(X => int.Parse(X)).ToArray();
        int CardCntG = wkArr[0];
        int CardCntC = wkArr[1];
        int CardCntP = wkArr[2];

        char[] SArr = InputList[1].ToCharArray();
        int AiteCntG = SArr.Count(X => X == 'G');
        int AiteCntC = SArr.Count(X => X == 'C');
        int AiteCntP = SArr.Count(X => X == 'P');

        int Score = 0;

        //勝てるカードを全て割当
        Score += ExecWariate(ref CardCntG, ref AiteCntC) * 3;
        Score += ExecWariate(ref CardCntC, ref AiteCntP) * 3;
        Score += ExecWariate(ref CardCntP, ref AiteCntG) * 3;

        //あいこになるカードを全て割当
        Score += ExecWariate(ref CardCntG, ref AiteCntG);
        Score += ExecWariate(ref CardCntC, ref AiteCntC);
        Score += ExecWariate(ref CardCntP, ref AiteCntP);

        Console.WriteLine(Score);
    }

    //貪欲法で、カードを割当し、割当枚数を返す
    static int ExecWariate(ref int pCardCnt, ref int pAiteCnt)
    {
        int WillReturn;
        //全て割当可能の場合
        if (pCardCnt <= pAiteCnt) {
            WillReturn = pCardCnt;
            pCardCnt = 0;
            pAiteCnt -= pCardCnt;
            return WillReturn;
        }
        //一部割当可能の場合
        WillReturn = pAiteCnt;
        pCardCnt -= pAiteCnt;
        pAiteCnt = 0;
        return WillReturn;
    }
}