extern "C" {
#include <stdio.h>

struct te {
	int g;
	int c;
	int p;
};

int main(void)
{
	struct te yuki = {0, 0, 0};
	struct te teki = {0, 0, 0};
	scanf("%d%d%d", &yuki.g, &yuki.c, &yuki.p);
	int kei = yuki.g + yuki.c + yuki.p;
	for (int i = 0; i < kei;) {
		switch (getchar()) {
		case 'G':
			teki.g++;
			i++;
			break;
		case 'C':
			teki.c++;
			i++;
			break;
		case 'P':
			teki.p++;
			i++;
			break;
		}
	}

	int ten = 0;
	int min;

	min = yuki.g < teki.c ? yuki.g : teki.c;
	ten += min * 3;
	yuki.g -= min;
	teki.c -= min;

	min = yuki.c < teki.p ? yuki.c : teki.p;
	ten += min * 3;
	yuki.c -= min;
	teki.p -= min;

	min = yuki.p < teki.g ? yuki.p : teki.g;
	ten += min * 3;
	yuki.p -= min;
	teki.g -= min;

	min = yuki.g < teki.g ? yuki.g : teki.g;
	ten += min * 1;
	yuki.g -= min;
	teki.g -= min;

	min = yuki.c < teki.c ? yuki.c : teki.c;
	ten += min * 1;
	yuki.c -= min;
	teki.c -= min;

	min = yuki.p < teki.p ? yuki.p : teki.p;
	ten += min * 1;
	yuki.p -= min;
	teki.p -= min;

	printf("%d\n", ten);
	return 0;
}
}