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 d = new int[](3);
  foreach (si; s)
    ++d[si.predSwitch('G', 0, 'C', 1, 'P', 2)];

  auto r = 0;

  foreach (i; 0..3) {
    auto t = min(c[i], d[(i+1)%3]);
    r += t*3;
    c[i] -= t;
    d[(i+1)%3] -= t;
  }

  foreach (i; 0..3) {
    auto t = min(c[i], d[i]);
    r += t;
    c[i] -= t;
    d[i] -= t;
  }

  writeln(r);
}