yuki = [0]*3

S = input()
S = S.split()

yuki[0] = int(S[0])
yuki[1] = int(S[1])
yuki[2] = int(S[2])

S = list(input())

aite = [0]*3
for c in S:
	if c is 'G':
		aite[0]+=1
	elif c is 'C':
		aite[1]+=1
	elif c is 'P':
		aite[2]+=1


point = 0

a = min(aite[0], yuki[2])
aite[0]-=a
yuki[2]-=a
point+=(3*a)
a = min(aite[1], yuki[0])
aite[1]-=a
yuki[0]-=a
point+=(3*a)
a = min(aite[2], yuki[1])
aite[2]-=a
yuki[1]-=a
point+=(3*a)

for i in range(3):
	a = min(aite[i], yuki[i])
	point+=a

print(point)