#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(int i = 0;i < s.size();i++){
      if(s[i] == 'G') enemy[0]++;
      else if(s[i] == 'C') enemy[1]++;
      else enemy[2]++;
   }
   ans += 3 * (min(yuki[0],enemy[1]) + min(yuki[1],enemy[2]) + min(yuki[2],enemy[0]));
   yuki[0] -= min(yuki[0],enemy[1]);
   enemy[1] -= min(yuki[0],enemy[1]);
   yuki[1] -= min(yuki[1],enemy[2]);
   enemy[2] -= min(yuki[1],enemy[2]);
   yuki[2] -= min(yuki[2],enemy[0]);
   enemy[3] -= min(yuki[2],enemy[0]);
   ans += min(yuki[0],enemy[0]) + min(yuki[1],enemy[1]) + min(yuki[2],enemy[2]);
   cout << ans << endl;
}