G, C, P = map(int, input().split())
S = input()
g = c = p = 0
for s in S:
    if s == "G":
        g += 1
    elif s == "C":
        c += 1
    else:
        p += 1
        
mi = min(G, c)
ans = mi * 3
G -= mi
c -= mi
mi = min(C, p)
ans += mi * 3
C -= mi
p -= mi
mi = min(P, g)
ans += mi * 3
P -= mi
g -= mi

ans += min(g, G) + min(c, C) + min(p, P)
print(ans)