#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <map>
#include <vector>
#include <algorithm>
using namespace std;

//namaega184
  
int main(){
	int g,c,p;char s[501];scanf("%d%d%d%s",&g,&c,&p,s);
	int gg=0,cc=0,pp=0; 
	int len=strlen(s);
	
	int ans=0;
	for(int i=0;i<len;i++){
		if(s[i]=='G')gg++;
		else if(s[i]=='C')cc++;
		else pp++;
	}
	
	int tmp=min(p,gg);
	ans+=tmp*3;
	p-=tmp,gg-=tmp;
	tmp=min(g,cc);
	ans+=tmp*3;
	g-=tmp,cc-=tmp;
	tmp=min(c,pp);
	ans+=tmp*3;
	c-=tmp,pp-=tmp;
	
	printf("%d\n",ans+min(g,gg)+min(p,pp)+min(c,cc));
	
	return 0;

}