import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int g = sc.nextInt();
        int c = sc.nextInt();
        int p = sc.nextInt();
        char[] arr = sc.next().toCharArray();
        int gCount = 0;
        int cCount = 0;
        int pCount = 0;
        for (char cc : arr) {
            switch (cc) {
                case 'G' :
                    gCount++;
                    break;
                case 'C' :
                    cCount++;
                    break;
                case 'P' :
                    pCount++;
                    break;
            }
        }
        int point = 0;
        if (gCount > p) {
            point += p * 3;
            gCount -= p;
            p = 0;
        } else {
            point += gCount * 3;
            p -= gCount;
            gCount = 0;
        }
        if (cCount > g) {
            point += g * 3;
            cCount -= g;
            g = 0;
        } else {
            point += cCount * 3;
            g -= cCount;
            cCount = 0;
        }
        if (pCount > c) {
            point += c * 3;
            pCount -= c;
            c = 0;
        } else {
            point += pCount * 3;
            c -= pCount;
            pCount = 0;
        }
        point += Math.min(gCount, g);
        point += Math.min(cCount, c);
        point += Math.min(pCount, p);
        System.out.println(point);
    }
}