// Enjoy your stay.

#include <bits/stdc++.h>

#define long long long
#define LOOPVAR_TYPE long

#define all(x) (x).begin(), (x).end()
#define sz(x) ((LOOPVAR_TYPE)(x).size())
#define foreach(it, X) for(__typeof((X).begin()) it = (X).begin(); it != (X).end(); it++)
#define GET_MACRO(_1, _2, _3, NAME, ...) NAME
#define _rep(i, n) _rep2(i, 0, n)
#define _rep2(i, a, b) for(LOOPVAR_TYPE i = (LOOPVAR_TYPE)(a); i < (LOOPVAR_TYPE)(b); i++)
#define rep(...) GET_MACRO(__VA_ARGS__, _rep2, _rep)(__VA_ARGS__)

#define fir first
#define sec second
#define mp make_pair
#define mt make_tuple
#define pb push_back

const double EPS = 1e-9;
const double PI = acos(-1.0);
const long INF = 1070000000LL;
const long MOD = 1000000007LL;

using namespace std;

typedef istringstream iss;
typedef stringstream sst;
typedef pair<LOOPVAR_TYPE, LOOPVAR_TYPE> pi;
typedef vector<LOOPVAR_TYPE> vi;



int main(){
	cin.tie(0);
	ios_base::sync_with_stdio(0);
	
	int g,c,p;
	string s;
	cin>>g>>c>>p>>s;
	int G=0,C=0,P=0;
	rep(i,sz(s)){
		if(s[i]=='G')G++;
		else if(s[i]=='C')C++;
		else P++;
	}
	int mi;
	mi = min(g,C);
	int ans = mi*3;
	g-=mi;
	C-=mi;
	mi = min(c,P);
	ans += mi*3;
	c-=mi;
	P-=mi;
	mi = min(p,G);
	ans += mi*3;
	p-=mi;
	G-=mi;
	ans += min(g,G);
	ans += min(c,C);
	ans += min(p,P);
	cout<<ans<<endl;
}