acpc2016day1A.cpp

signed main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);

    int N, M, A, B;
    cin >> N >> M >> A >> B;
    vi D(N);
    rep(i, N) cin >> D[i];

    int i;
    for (i = 0; i < N && D[i] >= A; i++) {
        ;
    }

    if (N - i < M) {
        for (i = i - 1 ; i >= 0 && D[i] <= B; i--) {
            ;
        }
        cout << i + 1 << endl;
    } else {
        cout << i << endl;
    }

}