#include<stdio.h>

int main(void){
	int A[3],B[3]={0};
	int P=0,tmp,i;
	char c;

	scanf("%d %d %d ",&A[0],&A[1],&A[2]);
	while((c=getchar())!='\n'){
		switch(c){
				case 'C':B[0]++; break;
				case 'P':B[1]++; break;
				case 'G':B[2]++; break;
		}
	}
	for(i=0;i<3;i++){
		tmp=A[i]<B[i]?A[i]:B[i];
		P+=tmp*3;
		A[i]-=tmp;
		B[i]-=tmp;
	}
	for(i=0;i<3;i++){
		tmp=A[(i+1)%3]<B[i]?A[(i+1)%3]:B[i];
		P+=tmp;
	}

	printf("%d\n",P);

	return 0;
}