using static System.Math;
using System;

public class Hello
{
    public static int g, c, p, g2, c2, p2;
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
         g = int.Parse(line[0]);
         c = int.Parse(line[1]);
         p = int.Parse(line[2]);
        var gcp = g + c + p;
        var s = Console.ReadLine().Trim();
         g2 = gcp - s.Replace("G", "").Length;
         c2 = gcp - s.Replace("C", "").Length;
         p2 = gcp - g2 - c2;
        getAns();
    }
    static void getAns()
    {
        var ans = 0;
        var gwin = Min(g, c2);
        ans += gwin * 3;
        g -= gwin;
        c2 -= gwin;
        var cwin = Min(c, p2);
        ans += cwin * 3;
        c -= cwin;
        p2 -= cwin;
        var pwin = Min(p, g2);
        ans += pwin * 3;
        p -= pwin;
        g2 -= pwin; ;
        var gd = Min(g, g2);
        ans += gd;
        var cd = Min(c, c2);
        ans += cd;
        var pd = Min(p, p2);
        ans += pd;
        Console.WriteLine(ans);
    }
}