import java.util.Arrays;
import java.util.Scanner;

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[] string = sc.next().toCharArray();
		Arrays.sort(string);
		sc.close();

		int oG = 0;
		int oC = 0;
		int oP = 0;
		for (char d : string) {
			if (d == 'G') {
				oG++;
			} else if (d == 'C') {
				oC++;
			} else {
				oP++;
			}
		}
		int point = 0;
		point += Math.min(G, oC) * 3;
		point += Math.min(C, oP) * 3;
		point += Math.min(P, oG) * 3;

		if (G >= oC) {
			G -= oC;
			oC = 0;
		} else {
			oC -= G;
			G = 0;
		}

		if (C >= oP) {
			C -= oP;
			oP = 0;
		} else {
			oP -= C;
			C = 0;
		}

		if (P >= oG) {
			P -= oG;
			oG = 0;
		} else {
			oG -= P;
			P = 0;
		}

		point += Math.min(G, oG);
		point += Math.min(C, oC);
		point += Math.min(P, oP);

		System.out.println(point);

	}

}