package yukicoder;

import java.util.Scanner;

public class N161
{
	static int score=0;
	static int[] gcp=new int[3];
	static int[] ygcp=new int[3];
	public static void main(String[] args)
	{
		Scanner sc = new Scanner(System.in);
		for(int i=0;i<3;i++)
		{
			gcp[i]=sc.nextInt();
		}
		String you=sc.next();
		for(int i=0;i<you.length();i++)
		{
			switch(you.substring(i, i+1))
			{
				case "G":
					ygcp[0]++;
					break;
				case "C":
					ygcp[1]++;
					break;
				case "P":
					ygcp[2]++;
					break;
			}
		}
		for(int i=0;i<3;i++)
		{
			if(ygcp[(i+1)%3]>=gcp[i])
			{
				ygcp[(i+1)%3]-=gcp[i];score+=3*gcp[i];gcp[i]=0;
			}
			else
			{
				gcp[i]-=ygcp[(i+1)%3];score+=3*ygcp[(i+1)%3];ygcp[(i+1)%3]=0;
			}
		}
		for(int i=0;i<3;i++)
		{
			score=(ygcp[i]>=gcp[i])?score+gcp[i]:score+ygcp[i];
		}
		
		
		System.out.println(score);
	}

}