#include <iostream>
using namespace std;

int main(){
   int ans = 0;
   int yuki[3],enemy[3] = {};
   string s;
   cin >> yuki[0] >> yuki[1] >> yuki[2] >> s;
   for(char c:s){
      if(c == 'G') enemy[0]++;
      else if(c == 'C') enemy[1]++;
      else enemy[2]++;
   }
   int minimum = min(yuki[0],enemy[1]);
   ans += minimum;
   yuki[0] -= minimum;
   enemy[1] -= minimum;
   minimum = min(yuki[1],enemy[2]);
   ans += minimum;
   yuki[1] -= minimum;
   enemy[2] -= minimum;
   minimum = min(yuki[2],enemy[0]);
   ans += minimum;
   yuki[2] -= minimum;
   enemy[0] -= minimum;
   ans *= 3;
   ans += min(yuki[0],enemy[0]);
   ans += min(yuki[1],enemy[1]);
   ans += min(yuki[2],enemy[2]);
   cout << ans << endl;
}