G,C,P = map(int,raw_input().split(' '))#GCP
S = raw_input()
count = 0
g,c,p = 0,0,0
for s in S:
	if s == 'G':
		g += 1
	if s == 'C':
		c += 1
	if s == 'P':
		p += 1
count = (g + c + p) * 3
print count