# Read input
G, C, P = map(int, input().split())
S = input().strip()

# Count opponent's moves
cnt_G = S.count('G')
cnt_C = S.count('C')
cnt_P = S.count('P')

# Calculate maximum wins for each type
a = min(cnt_G, P)
b = min(cnt_C, G)
c = min(cnt_P, C)

# Remaining opponent's moves after wins
rem_G = cnt_G - a
rem_C = cnt_C - b
rem_P = cnt_P - c

# Remaining moves for yuki
yg_rem = G - b
yc_rem = C - c
yp_rem = P - a

# Calculate maximum draws
draw_G = min(rem_G, yg_rem)
draw_C = min(rem_C, yc_rem)
draw_P = min(rem_P, yp_rem)

# Total score
total_score = 3 * (a + b + c) + (draw_G + draw_C + draw_P)

print(total_score)