#include <bits/stdc++.h>
#define REP(i,n,N) for(int i=(n);i<(int) N;i++)
#define p(s) cout<<(s)<<endl
using namespace std;

int main(){
	int a[3],b[3]={0};
	string s;
	cin>>a[0]>>a[1]>>a[2]>>s;
	REP(i,0,s.size()){
		if(s[i]=='G') b[0]++;
		else if(s[i]=='C') b[1]++;
		else if(s[i]=='P') b[2]++;
	}
	int ans=0;
	REP(i,0,3){
		int tmp=min(a[i],b[(i+1)%3]);
		a[i]-=tmp;
		b[(i+1)%3]-=tmp;
		ans+=3*tmp;
	}
	REP(i,0,3){
		ans+=min(a[i],b[i]);
	}
	p(ans);
	return 0;
}