#include <bits/stdc++.h>
using namespace std;

int main() {
	int g[3];
	cin >> g[0]>>g[1]>>g[2];
	string s;
	cin >> s;
	int g2[3]={ 0 };
	for (int i = 0;i < s.size();i++) {
		switch (s[i]) {
		case 'G':
			g2[0]++;
			break;
		case 'C':
			g2[1]++;
			break;
		case 'P':
			g2[2]++;
			break;
		}
	}
	int ans = 0;
	int d2[] = { 1,2,0 };
	for (int i = 0;i < 3;i++) {
		int mi = min(g[i], g2[d2[i]]);
		g[i] -= mi;
		g2[d2[i]] -= mi;
		ans += 3 * mi;
	}
	for (int i = 0;i < 3;i++) {
		int mi = min(g[i], g2[i]);
		g[i] -= mi;
		g2[i] -= mi;
		ans += mi;
	}
	cout << ans << endl;

	return 0;


}