package main

import (
	"fmt"
)

func min(x, y int) int {
	if y < x {
		return y
	}
	return x
}

func main() {
	var G, C, P, oG, oC, oP, gWin, cWin, pWin int
	var S string
	fmt.Scan(&G, &C, &P, &S)
	for _, r := range S {
		switch r {
		case 'G':
			oG++
		case 'C':
			oC++
		case 'P':
			oP++
		}
	}
	gWin, cWin, pWin = min(G, oC), min(C, oP), min(P, oG)
	G -= gWin
	oC -= gWin
	C -= cWin
	oP -= cWin
	P -= pWin
	oG -= pWin
	res := 3*(gWin+cWin+pWin) + min(G, oG) + min(C, oC) + min(P, oP)
	fmt.Println(res)
}