#janken
M=[int(i) for i in input().split()]
S=input()
#rint (G)
Y=[0]*3
for i in range(len(S)):
#    print (i)
    if S[i]=="G":
        Y[0]+=1
    elif S[i]=="C": 
        Y[1]+=1
    elif S[i]=="P":
        Y[2]+=1
T=0
for i in range (3):
    j=i+1
    j%=3
    if M[i]>Y[j]:
        T+=3*Y[j]
        M[i]-=Y[j]
        Y[j]-=Y[j]
    else:
        T+=3*M[i]
        Y[j]-=M[i]
        M[i]-=M[i]
for i in range (3):
    if M[i]>0 and Y[i]>0:
        if M[i]> Y[i]:
            T+=Y[i]
        else:
            T+=M[i]
print(T)