#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int u[3], e[3];
int main(void){
	cin >> u[0] >> u[1] >> u[2];
	string s; cin >> s;
	for (char c : s){
		if (c == 'G') e[0]++;
		if (c == 'C') e[1]++;
		if (c == 'P') e[2]++;
	}
	int ans = 0;
	for (int i = 0; i < 3; i++){
		int k = min(u[i], e[(i + 1) % 3]);
		ans += 3 * k;
		u[i] -= k;
		e[(i + 1) % 3] -= k;
	}
	for (int i = 0; i < 3; i++){
		ans += min(u[i], e[i]);
	}
	cout << ans << endl;
	return 0;
}