from collections import deque
g, c, p = map(int, input().split())
S = input()
fg = S.count('G')
fc = S.count('C')
fp = S.count('P')
yuki = [g, c, p]
friend = [fc, fp, fg]

ans = 0
result_y = []
result_f = []
for j, k in zip(yuki, friend):
    if j > k:
        ans += k * 3
        result_y.append(j - k)
        result_f.append(0)
    elif k > j:
        ans += j * 3
        result_y.append(0)
        result_f.append(k - j)
    else:
        ans += j * 3
        result_y.append(0)
        result_f.append(0)
        
result_f = deque(result_f)       
result_f.rotate(1)
result_f = list(result_f)

for n, m in zip(result_y, result_f):
    if n > m:
        ans += m
    elif m > n:
        ans += n
    else:
        ans += n

print(ans)