#include <iostream>
#include <algorithm>
#include <stdlib.h>
#include <string>
using namespace std;

int pow(int m,int n){
if (n==0) n=4;
int k=m;
for(int i=0;i<n-1;i++){
k=(k*m)%10;

}
return k;

}




int main() {

int g,c,p;
string s;
cin>>g>>c>>p;
cin>>s;
int n=s.length();
int a[4]={0};
for(int i=0;i<n;i++){
if(s[i]=='G') a[0]++;
if(s[i]=='C') a[1]++;
if(s[i]=='P') a[2]++;
}
int ans=0;

int k=min(g,a[1]);
g=g-k;
a[1]=a[1]-k;
ans=ans+3*k;

k=min(c,a[2]);
c=c-k;
a[2]=a[2]-k;
ans=ans+3*k;

k=min(p,a[0]);
p=p-k;
a[0]=a[0]-k;
ans=ans+3*k;

k=min(g,a[0]);
g=g-k;
a[0]=a[0]-k;
ans=ans+k;

k=min(c,a[1]);
c=c-k;
a[1]=a[1]-k;
ans=ans+k;

k=min(p,a[2]);
p=p-k;
a[2]=a[2]-k;
ans=ans+k;




cout<<ans<<endl;



	return 0;
}