#include <bits/stdc++.h>
using namespace std;
int main(){
	string s;
	int me[3],you[4];
	memset(you,0,sizeof(you));
	for(int i=0;i<3;i++){
		cin>>me[i];
	}
	cin>>s;
	for(int i=0;i<s.size();i++){
		if(s[i]=='G'){
			you[0]++;
			you[3]++;
		}
		if(s[i]=='C'){
			you[1]++;
		}
		if(s[i]=='P'){
			you[2]++;
		}
	}
	int ans=0;
	for(int i=0;i<3;i++){
		if(me[i]>you[i+1]){
			ans+=3*you[i+1];
			me[i]-=you[i+1];
			you[i+1]=0;
			if(i+1==3)you[0]=you[3];
		}else{
			ans+=3*me[i];
			you[i+1]-=me[i];
			me[i]=0;
			if(i+1)you[0]=you[3];
		}
	}
	for(int i=0;i<3;i++){
		if(you[i]>0){
			if(me[i]>you[i]){
				ans+=you[i];
			}else {
				ans+=me[i];
			}
		}
	}
	cout<<ans<<endl;
}