#include <iostream>
#include <string>
using namespace std;

int main(){
	int g,c,p;	cin>>g>>c>>p;
	string s;	cin>>s;
	int og=0,oc=0,op=0;
	for(int i=0;i<(int)s.size();i++){
		if(s[i]=='G')	og++;
		else if(s[i]=='C')	oc++;
		else 	op++;
	}
	int point=0;
	if(og<=p){
		point+=3*og;	p-=og;	og=0;
	}
	else{
		point+=3*p;	og-=p;	p=0;
	}
	if(oc<=g){
		point+=3*oc;	g-=oc;	oc=0;
	}
	else{
		point+=3*g;	oc-=g;	g=0;
	}
	if(op<=c){
		point+=3*op;	c-=op;	op=0;
	}
	else{
		point+=3*c;	op-=c;	c=0;
	}
	point+=min(og,g)+min(oc,c)+min(op,p);
	cout<<point<<endl;
	return 0;
}