import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int G = scan.nextInt();
		int C = scan.nextInt();
		int P = scan.nextInt();
		String S = scan.next();
		scan.close();
		// 相手の各手の数
		int cnt1 = 0;
		int cnt2 = 0;
		int cnt3 = 0;
		for(int i = 0; i < S.length(); i++) {
			char c = S.charAt(i);
			if(c == 'G') {
				cnt1++;
			}else if(c == 'C') {
				cnt2++;
			}else {
				cnt3++;
			}
		}
		//System.out.println(cnt1 +" " + cnt2 + " "+ cnt3);
		// 勝つパターン
		int m1 = Math.min(G, cnt2);
		int m2 = Math.min(C, cnt3);
		int m3 = Math.min(P, cnt1);

		int p3 = m1 + m2 + m3;

		G -= m1; cnt2 -= m1;
		C -= m2; cnt3 -= m2;
		P -= m3; cnt1 -= m3;

		// あいこ
		m1 = Math.min(G, cnt1);
		m2 = Math.min(C, cnt2);
		m3 = Math.min(P, cnt3);

		int p2 =  m1 + m2 + m3;
		int ans = 3 * p3 + p2;

		System.out.println(ans);
	}
}