import java.util.Scanner;

public class Main {

	@SuppressWarnings("resource")
	public static void main(String args[]) {
		Scanner scanner = new Scanner(System.in);
		int g=scanner.nextInt();
		int c=scanner.nextInt();
		int p=scanner.nextInt();
		String s=scanner.next();
		int I[]= {g,c,p};
		int Y[]=new int[3];
		int sc=0;
		for(int i=0;i<s.length();i++) {
			char y=s.charAt(i);
			if(y=='G')Y[0]++;
			else if(y=='C')Y[1]++;
			else Y[2]++;
		}
		for(int i=0;i<3;i++) {
			int yi=i+1;
			if(yi==3)yi=0;
			if(I[i]<=Y[yi]) {
				sc+=I[i]*3;
				Y[yi]-=I[i];
				I[i]=0;
			}
			else {
				sc+=Y[yi]*3;
				I[i]-=Y[yi];
				Y[yi]=0;
			}
		}
		for(int i=0;i<3;i++) {
			int yi=i;
			if(yi==3)yi=0;
			if(I[i]<=Y[yi]) {
				sc+=I[i];
				Y[yi]-=I[i];
				I[i]=0;
			}
			else {
				sc+=Y[yi];
				I[i]-=Y[yi];
				Y[yi]=0;
			}
		}
		System.out.println(sc);
	}
}