def bat(my,enemy): 
    if(my==enemy):
        return 1   
    else:
        if(my=="G"):
            if(enemy=="C"):
                return 3
        if(my=="P"):
            if(enemy=="G"):
                return 3
        if(my=="C"):
            if(enemy=="P"):
                return 3
    return 0

draw=list(map(int,input().split()))
S=input()

b={}
for i,s in enumerate(["G","C","P"]):
    b[s]=draw[i]

point=0
li=[]
for i in range(len(S)):
    for s in ["G","C","P"]:
        if(b[s]!=0):
            if(bat(s,S[i])==3):
                point+=3
                b[s]-=1
                li.append(i)
                break

for i in range(len(S)):
    if i not in li:                
        for s in ["G","C","P"]:
            if(b[s]!=0):
                if(bat(s,S[i])==1):
                    point+=1
                    b[s]-=1
                    break
    
print(point)