G0, C0, P0 = map(int, input().split())
S = str(input())
G1, C1, P1 = 0, 0, 0
for c in S:
    if c == 'G':
        G1 += 1
    elif c == 'C':
        C1 += 1
    else:
        P1 += 1
ans = 0
ans += min(G0, C1)*3
G0, C1 = G0-min(G0, C1), C1-min(G0, C1)

ans += min(C0, P1)*3
C0, P1 = C0-min(C0, P1), P1-min(C0, P1)

ans += min(P0, G1)*3
P0, G1 = P0-min(P0, G1), G1-min(P0, G1)

ans += min(G0, G1)
G0, G1 = G0-min(G0, G1), G1-min(G0, G1)

ans += min(C0, C1)
C0, C1 = C0-min(C0, C1), C1-min(C0, C1)

ans += min(P0, P1)
P0, P1 = P0-min(P0, P1), P1-min(P0, P1)

print(ans)