N=int(input())
A,B=map(int,input().split())
P=list(map(int,input().split()))
for i in range(N):
    if P[i]==1:
        if A==0:
            print(i+1)
            exit()
        A-=1
    elif P[i]==2:
        if B==0:
            print(i+1)
            exit()
        B-=1
    else:
        if 0 in [A,B]:
            print(i+1)
            exit()
        A-=1
        B-=1

print(-1)