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 x[]= {g,c,p};
		int sc=0;
		for(int i=0;i<s.length();i++) {
			char y=s.charAt(i);
			int tar=0;
			if(y=='G')tar=2;
			else if(y=='C')tar=0;
			else tar=1;
			int cnt=0;
			while(x[tar]==0) {
				tar++;
				if(tar==3)tar=0;
				cnt++;
			}
			x[tar]--;
			if(cnt==0)sc+=3;
			else if(cnt==1)sc++;
		}
		System.out.println(sc);
	}
}