#include <iostream>
#include <algorithm>
using namespace std;

int main(){
  int g,c,p;
  string s;
  cin>>g>>c>>p;
  cin>>s;
  int fg,fc,fp;
  fg=0;
  fc=0;
  fp=0;
  for(int i=0; i<s.size(); ++i){
    if(s[i]=='G') fg++;
    if(s[i]=='C') fc++;
    if(s[i]=='P') fp++;
  }
  int x;
  x=0;
  int m;
  m=min(g,fc);
  x+=m*3;
  g-=m;
  fc-=m;
  m=min(c,fp);
  x+=m*3;
  c-=m;
  fp-=m;
  m=min(p,fg);
  x+=m*3;
  p-=m;
  fg-=m;

  m=min(g,fg);
  x+=m*1;
  g-=m;
  fg-=m;
  m=min(c,fc);
  x+=m*1;
  c-=m;
  fc-=m;
  m=min(p,fp);
  x+=m*1;
  p-=m;
  fp-=m;

  cout<<x<<endl;
  return 0;
}