n = int(input())
a, b = map(int, input().split())
p = list(map(int, input().split()))


for i in range(n):
    if p[i] == 1:
        a -= 1
    elif p[i] == 2:
        b -= 1
    elif p[i] == 3:
        a -= 1
        b -= 1

    if a == 0 or b == 0:
        for j in range(i+1, n):
            if a == 0 and p[j] in [1, 3]:
                print(j + 1)
                exit()
            
            if b == 0 and p[j] in [2, 3]:
                print(j + 1)
                exit()
        print(-1)
        exit()

print(-1)