#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <cmath>
#include <string>
#include <vector>
#include <algorithm>
#include <queue>
#include <map>
#include <functional>
#include <set>
#include <numeric>
#include <stack>
#include <utility>
#include <time.h>
//#include "util.h"

using namespace std;
typedef unsigned uint;
typedef long long ll;
typedef unsigned long long ull;

template <typename _KTy, typename _Ty> ostream& operator << (ostream& ostr, const pair<_KTy, _Ty>& m) { cout << "{" << m.first << ", " << m.second << "}"; return ostr; }
template <typename _Ty> ostream& operator << (ostream& ostr, const vector<_Ty>& v) { if (v.empty()) { cout << "{ }"; return ostr; }	cout << "{" << v.front(); for (auto itr = ++v.begin(); itr != v.end(); itr++) { cout << ", " << *itr; }	cout << "}"; return ostr; }
template <typename _Ty> ostream& operator << (ostream& ostr, const set<_Ty>& s) { if (s.empty()) { cout << "{ }"; return ostr; } cout << "{" << *(s.begin()); for (auto itr = ++s.begin(); itr != s.end(); itr++) { cout << ", " << *itr; }	cout << "}"; return ostr; }

#define PI 3.14159265358979323846
#define EPS 1e-6
#define MIN(a,b) ((a)<(b)?(a):(b))
#define MAX(a,b) ((a)>(b)?(a):(b))
#define all(x) (x).begin(), (x).end()


int yuki0161() 
{
	// GCP[i][j] : プレイヤー i の 手 j を出せる(出す)回数 (j : 0 - 'G', 1 - 'C', 2 - 'P')
	int GCP[2][3] = { 0 };
	string S;
	cin >> GCP[0][0] >> GCP[0][1] >> GCP[0][2] >> S;

	for (uint i = 0; i < S.size(); i++) {
		if (S[i] == 'G')
			GCP[1][0]++;
		else if (S[i] == 'C')
			GCP[1][1]++;
		else
			GCP[1][2]++;
	}

	int ans = 0;
	//win
	for (int i = 0; i < 3; i++) {
		int w = min(GCP[0][i], GCP[1][(i + 1) % 3]);
		GCP[0][i] -= w;
		GCP[1][(i + 1) % 3] -= w;
		ans += 3 * w;
	}
	//draw
	for (int i = 0; i < 3; i++)
		ans += min(GCP[0][i], GCP[1][i]);

	cout << ans << endl;

	return 0;
}

int main()
{
	//clock_t start, end;
	//start = clock();

	yuki0161();

	//end = clock();
	//printf("%d msec.\n", end - start);

	return 0;
}