G, C, P = map(int, input().split())
S = input().rstrip()
EG, EC, EP = 0, 0, 0
for s in S:
    if s == "G":
        EG += 1
    elif s == "C":
        EC += 1
    else:
        EP += 1
ans = 0
ans += 3 * min(G, EC)
if G >= EC:
    G -= EC
    EC = 0
else:
    EC -= G
    G = 0
ans += 3 * min(C, EP)
if C >= EP:
    C -= EP
    EP = 0
else:
    EP -= C
    C = 0
ans += 3 * min(P, EG)
if P >= EG:
    P -= EG
    EG = 0
else:
    EG -= P
    P = 0
ans += min(G, EG)
ans += min(C, EC)
ans += min(P, EP)
print(ans)