use std::cmp::min;
use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let mut g: usize = itr.next().unwrap().parse().unwrap();
    let mut c: usize = itr.next().unwrap().parse().unwrap();
    let mut p: usize = itr.next().unwrap().parse().unwrap();
    let s: Vec<char> = itr.next().unwrap().chars().collect();

    let mut ans = 0;
    let mut ag = 0;
    let mut ac = 0;
    let mut ap = 0;
    for i in 0..s.len() {
        if s[i] == 'G' {
            if p > 0 {
                p -= 1;
                ans += 3;
            } else {
                ag += 1;
            }
        }
        if s[i] == 'C' {
            if g > 0 {
                g -= 1;
                ans += 3;
            } else {
                ac += 1;
            }
        }
        if s[i] == 'P' {
            if c > 0 {
                c -= 1;
                ans += 3;
            } else {
                ap += 1;
            }
        }
    }

    ans += min(ag, g) + min(ac, c) + min(ap, p);
    println!("{}", ans);
}