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

X=Y=Z=0
for s in S:
    if s=="G":
        X+=1
    elif s=="C":
        Y+=1
    else:
        Z+=1

Score=0

alpha=min(G,Y)
beta =min(C,Z)
gamma=min(P,X)
Score=3*(alpha+beta+gamma)

G-=alpha;Y-=alpha
C-=beta ;Z-=beta
P-=gamma;X-=gamma

alpha=min(G,X)
beta =min(C,Y)
gamma=min(P,Z)

Score+=alpha+beta+gamma

print(Score)
assert 1