using System;

class Program
{
    static void Main()
    {
        var tmp = Console.ReadLine().Split();
        int g = int.Parse(tmp[0]);
        int c = int.Parse(tmp[1]);
        int p = int.Parse(tmp[2]);
        var s = Console.ReadLine();

        int g2, c2, p2;
        g2 = c2 = p2 = 0;
        for(int i = 0; i < s.Length; i++)
        {
            if (s[i] == 'G') g2++;
            else if (s[i] == 'C') c2++;
            else p2++;
        }

        int ans = 0;

        int gwin = Math.Min(g, c2);
        int cwin = Math.Min(c, p2);
        int pwin = Math.Min(p, g2);
        g -= gwin; c2 -= gwin;
        c -= cwin; p2 -= cwin;
        p -= pwin; g2 -= pwin;
        ans += (gwin + cwin + pwin) * 3;

        int gtie = Math.Min(g, g2);
        int ctie = Math.Min(c, c2);
        int ptie = Math.Min(p, p2);
        ans += gtie + ctie + ptie;

        Console.WriteLine(ans);
    }
}