#include <iostream>
using namespace std;
int h1[3],h2[3];
int main(){
  cin>>h1[0]>>h1[1]>>h1[2];
  string s;cin>>s;
  for(int i=0,n=s.length();i<n;++i){
    if(s[i]=='G') h2[0]++;
    if(s[i]=='C') h2[1]++;
    if(s[i]=='P') h2[2]++;
  }

  int ans = 0;
  for(int i=0;i<3;++i){
    int h = min(h1[i],h2[(i+1)%3]);
    ans+=3*h;
    h1[i]-=h;
    h2[(i+1)%3]-=h;
  }

  for(int i=0;i<3;++i){
    ans+=min(h1[i],h2[i]);
  }

  cout << ans << endl;
  return 0;
}