X = list(map(int,input().split()))
S = input()
dic = {"G":0,"C":1,"P":2}
Y = [0] * 3
for s in S:
    Y[dic[s]] += 1
ans = 0
for i in range(3):
    i2 = (i+1) % 3
    if X[i] >= Y[i2]:
        ans += 3 * Y[i2]
        X[i] -= Y[i2]
        Y[i2] = 0
    else:
        ans += 3 * X[i]
        Y[i2] -= X[i]
        X[i] = 0
for i in range(3):
    if X[i] >= Y[i]:
        ans += Y[i]
        X[i] -= Y[i]
        Y[i] = 0
    else:
        ans += X[i]
        Y[i] -= X[i]
        X[i] = 0
print(ans)