using System;
using System.Linq;

namespace Seigen_Janken
{
    class Program
    {
        static void Main(string[] args)
        {
            Sol sol = new Sol();
            sol.Solve();
        }
    }

    class Sol
    {
        public void Solve()
        {
            int GN = Math.Min(G, eC);
            int CN = Math.Min(C, eP);
            int PN = Math.Min(P, eG);
            G -= GN; eC -= GN;
            C -= CN; eP -= CN;
            P -= PN; eG -= PN;

            int GDraw = Math.Min(G, eG);
            int CDraw = Math.Min(C, eC);
            int PDraw = Math.Min(P, eP);
            int aiko = GDraw + CDraw + PDraw;

            int ans = 3 * (GN + CN + PN) + aiko;
            Console.WriteLine(ans);
        }

        int G, C, P;
        string S;
        int eG, eC, eP;

        public Sol()
        {
            int[] t = ria();
            G = t[0];
            C = t[1];
            P = t[2];
            S = rs();
            eG = CountChar(S, 'G');
            eC = CountChar(S, 'C');
            eP = CountChar(S, 'P');
        }

        // 文字列s中に含まれるcの数を返す
        static int CountChar(string s, char c)
        {
            return s.Length - s.Replace(c.ToString(), "").Length;
        }

        public override string ToString()
        {
            return (string.Format("G:{0}, C:{1}, P{2}\n", G, C, P) + S + string.Format("\neG:{0}, eC:{1}, eP{2}", eG, eC, eP));
        }

        static String rs() { return Console.ReadLine(); }
        static int ri() { return int.Parse(Console.ReadLine()); }
        static long rl() { return long.Parse(Console.ReadLine()); }
        static double rd() { return double.Parse(Console.ReadLine()); }
        static String[] rsa() { return Console.ReadLine().Split(' '); }
        static int[] ria() { return Console.ReadLine().Split(' ').Select(e => int.Parse(e)).ToArray(); }
        static long[] rla() { return Console.ReadLine().Split(' ').Select(e => long.Parse(e)).ToArray(); }
        static double[] rda() { return Console.ReadLine().Split(' ').Select(e => double.Parse(e)).ToArray(); }
    }
}