me = map(int, raw_input().split())
hands = raw_input()
opp = [hands.count("G"), hands.count("C"), hands.count("P")]

score = 0

for i in range(3):
    win = min(me[i], opp[(i+1)%3])
    score += win * 3
    me[i] -= win
    opp[(i+1)%3] -= win

for i in range(3):
    draw = min(me[i], opp[i])
    score += draw * 1
    me[i] -= draw
    opp[i] -= draw

print score