#include <stdio.h>

int main(void){
	int i,j,k;
	int total = 0;
	int hand[4] = {0};
	char s[310];
	
	scanf("%d %d %d", &hand[0], &hand[1], &hand[2]);
	scanf("%s", s);
	for(i=0;i<3;i++){	// 0 win, 1 even, 2 lose
		for(j=0;j<3;j++){ // 0 G, 1 C, 2 P
			for(k=0;s[k] != '\0';k++){
				if(i == 0){
					if(hand[j] != 0){
						if(j==0 && s[k] == 'C'){
							hand[j]--;
							s[k] = '-';
							total += 3;
						}else if(j==1 && s[k] == 'P'){
							hand[j]--;
							s[k] = '-';
							total += 3;
						}else if(j==2 && s[k] == 'G'){
							hand[j]--;
							s[k] = '-';
							total += 3;
						}
					}
				}else if(i == 1){
					if(hand[j] != 0){
						if(j==0 && s[k] == 'G'){
							hand[j]--;
							s[k] = '-';
							total += 1;
						}else if(j==1 && s[k] == 'C'){
							hand[j]--;
							s[k] = '-';
							total += 1;
						}else if(j==2 && s[k] == 'P'){
							hand[j]--;
							s[k] = '-';
							total += 1;
						}
					}
				}
			}
		}
	}
	
	printf("%d\n", total);
	return 0;
}