#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000


int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
	int me[3];
	rep(i, 3) cin >> me[i];
	int ans = 0;
	int enemy[3] = {};
	string S; cin >> S;
	rep(i, S.length()) {
		if (S[i] == 'G') enemy[0]++;
		else if (S[i] == 'C') enemy[1]++;
		else enemy[2]++;
	}
	rep(i, 3) {
		int tmp = min(enemy[(i + 1) % 3], me[i]);
		ans += tmp * 3;
		enemy[(i + 1) % 3] -= tmp;
		me[i] -= tmp;
	}
	rep(i, 3) {
		int tmp = min(enemy[i], me[i]);
		ans += tmp;
	}
	cout << ans << endl;



    return 0;
}