function solve(a, b, ps)
    x = 0
    for (i, p) ∈ enumerate(ps)
        if p == "1"
            a -= 1
            a < 0 && return i
        elseif p == "2"
            b -= 1
            b < 0 && return i
        else
            a -= 1
            b -= 1
            (a < 0 || b < 0) && return i
        end
    end
    return -1
end
 
function main()
    n = readline()
    a, b = parse.(Int, split(readline()))
    ps = split(readline())
    result = solve(a, b, ps)
    println(result)
end
main()