import java.io.BufferedInputStream;
import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.*;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentSkipListSet;

public class Main {
	public static final int C =  1000000007;
	static final int CY = 1000000000;
	//static boolean MAP[][];
	static int N;
	static int X;
	static double P;
	static String S;
	static int M;
	static int MAX = -1;
	//static int tic[][];
	//static String S[];
	static long A[];
	static double W[];
	//static int max;
	static long DP[];
	static int ST[][];
	static ConcurrentSkipListSet<Integer> TS;
	static ArrayList<Integer> AL;
	public static void main(String[] args) {
		StringBuilder sb = new StringBuilder();
		BufferedInputStream bs = new BufferedInputStream(System.in);
		Scanner sc = new Scanner(bs);


		int[] gcp = new int[3];
		gcp[0] = sc.nextInt();
		gcp[1] = sc.nextInt();
		gcp[2] = sc.nextInt();
		String str = sc.next();
		int[] fgcp = new int[3];
		for (int i=0; i < str.length(); i++) {
			char c = str.charAt(i);
			if (c == 'G') fgcp[0]++;
			if (c == 'C') fgcp[1]++;
			if (c == 'P') fgcp[2]++;
		}
		long ans = 0;
		
		for (int i=0; i < 3; i++) {
			int f = i+1 == 3? 0:i+1;
			int num = Math.min(gcp[i], fgcp[f]);
			gcp[i] -= num;
			fgcp[f] -= num;
			ans += num * 3;
			
			
		}
		for (int i=0; i < 3; i++) {
		//	int f = i+1 == 3? 0:i+1;
			int num = Math.min(gcp[i], fgcp[i]);
			gcp[i] -= num;
			fgcp[i] -= num;
			ans += num * 1;
			
			
		}

		System.out.println(ans);

	}




}