#include <iostream>
using namespace std;
int eG,eC,eP;
int main(){
	int mG,mC,mP;cin>>mG>>mC>>mP;
	string s;cin>>s;
	for(int i = 0; s.size() > i; i++){
		if(s[i]=='G')eG++;
		if(s[i]=='C')eC++;
		if(s[i]=='P')eP++;
	}
	int a = 0;
	int t = 0;
	t = min(mG,eC);
	mG-=t;eC-=t;a+=t*3;
	t = min(mC,eP);
	mC-=t;eP-=t;a+=t*3;
	t = min(mP,eG);
	mP-=t;eG-=t;a+=t*3;

	cout << a+min(mG,eG)+min(mC,eC)+min(mP,eP) << endl;

}