package yukicoder;
import java.util.Scanner;
public class Main{
	public static void main(String[] args)throws Exception{
		new Main().solve();
	}
	void solve(){
		Scanner sc=new Scanner(System.in);
		int[] me=new int[3];
		for(int i=0;i<3;i++)me[i]=sc.nextInt();

		String s=sc.next();
		int[] enemy=new int[3];
		for(int i=0;i<s.length();i++){
			if(s.charAt(i)=='G')enemy[0]++;
			else if(s.charAt(i)=='C')enemy[1]++;
			else if(s.charAt(i)=='P')enemy[2]++;
		}
		int c=0;
		for(int i=0;i<3;i++){
			int a=Math.min(me[i],enemy[(i+1)%3]);
			c+=3*a;
			me[i]-=a;
			enemy[(i+1)%3]-=a;
		}
		for(int i=0;i<3;i++){
			int a=Math.min(me[i], enemy[i]);
			c+=a;
			me[i]-=a;
			enemy[i]-=a;
		}
		System.out.println(c);
	}
}