import java.util.Scanner;
public class Yuki161{
	public static void main(String[] arg){
		Scanner sc = new Scanner(System.in);
		int[] me = new int[3];
		int[] you = new int[3];
		int res=0;
		me[0] = sc.nextInt();
		me[1] = sc.nextInt();
		me[2] = sc.nextInt();
		String s = sc.next();
		for(int i = 0;i<s.length();i++){
			if(s.charAt(i) == 'G'){
				you[0]++;
			}else if(s.charAt(i) == 'C'){
				you[1]++;
			}else{
				you[2]++;
			}
		}
		for(int i = 0;i<3;i++){
			if(me[i] >= you[(i+1) % 3]){
				res += you[(i+1) % 3] * 3;
				me[i] -= you[(i+1) % 3];
				you[(i+1) % 3] = 0;
			}else{
				res += me[i] * 3;
				you[(i+1) % 3] -= me[i];
				me[i] = 0;
			}
		}
		for(int i = 0;i<3;i++){
			if(me[i] >= you[i]){
				res += you[i];
				me[i] -= you[i];
				you[i] = 0;
			}else{
				res += me[i];
				you[i] -= me[i];
				me[i] = 0;
			}
		}
		System.out.println(res);
	}
}