import std.algorithm, std.container, std.conv, std.math, std.range, std.typecons, std.stdio, std.string;

auto rdsp(){return readln.splitter;}
void pick(R,T)(ref R r,ref T t){t=r.front.to!T;r.popFront;}
void readV(T...)(ref T t){auto r=rdsp;foreach(ref v;t)pick(r,v);}
void readA(T)(size_t n,ref T[]t){t=new T[](n);auto r=rdsp;foreach(ref v;t)pick(r,v);}

void main()
{
  int[] c; readA(3, c);
  string s; readV(s);

  auto t = s.map!(si => si.predSwitch('G', 0, 'C', 1, 'P', 2));

  auto r = 0;
  foreach (ti; t) {
    if (c[(ti+2)%3]) {
      r += 3;
      --c[(ti+2)%3];
    } else if (c[ti]) {
      r += 1;
      --c[ti];
    } else {
      --c[(ti+1)%3];
    }
  }

  writeln(r);
}