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:  # p[i] == 3
        if A == 0 or B == 0:
            print(i + 1)
            exit()
        A -= 1
        B -= 1
print(-1)