#include <bits/stdc++.h>
using namespace std;

signed main(){
  int G, C, P; cin >> G >> C >> P;
  string S; cin >> S;
  int ans = 0;
  int a = 0, b = 0, c = 0;
  for( int i = 0; i < S.size(); ++i )
    a += S[ i ] == 'G',
    b += S[ i ] == 'C',
    c += S[ i ] == 'P';
  int f;
  ans += 3 * min( G, b ); f = min( G, b ), G -= f, b -= f;
  ans += 3 * min( C, c ), f = min( C, c ), C -= f, c -= f;
  ans += 3 * min( P, a ), f = min( P, a ), P -= f, a -= f;
  ans += min( G, a ) + min( C, b ) + min( P, c );
  cout << ans << endl;
  return 0;
}