G,C,P = map(int,input().split())
S = input().strip()
A = {"G":0,"C":0,"P":0}
for a in S:
    A[a] += 1
ans = 0
ans += 3*(min(G,A["C"])+min(C,A["P"])+min(P,A["G"]))
G,A["C"] = max(0,G-A["C"]),max(0,A["C"]-G)
C,A["P"] = max(0,C-A["P"]),max(0,A["P"]-C)
P,A["G"] = max(0,P-A["G"]),max(0,A["G"]-P)
ans += min(G,A["G"])+min(C,A["C"])+min(P,A["P"])
print(ans)