#include <stdio.h>
#include <string.h>
#define MAX 300

int main(void)
{
    int point = 0, G,C,P,count,i;
    char S[MAX];

    scanf("%d%d%d",&G,&C,&P);
    scanf("%s",S);

    count = G+C+P;

    for (i = 0; i < count; i++) {
        if (S[i] == 'G') {
            if (P > 0) {
                P--;
                point += 3;
            }
        } else if (S[i] == 'C') {
            if (G > 0) {
                G--;
                point += 3;
            }
        } else if (S[i] == 'P') {
            if (C > 0) {
                C--;
                point += 3;
            }
        }
    }

    for (i = 0; i < count; i++) {
        if (S[i] == 'G') {
            if (G > 0) {
                G--;
                point++;
            }
        } else if (S[i] == 'C') {
            if (C > 0) {
                C--;
                point++;
            }
        } else if (S[i] == 'P') {
            if (P > 0) {
                P--;
                point++;
            }
        }
    }

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

    return (0);
}