signed main() {
//    thisComputer = (argc == 2);
    seriy();
    int n, m;
    cin >> n >> m;
    if(m == 0) {
        int h = 1, w = 1;
        int k = n - 1;
        while(k > 0) {
            if(h < w) {
                h++;
                k -= w;
            }
            else {
                w++;
                k -= h;
            }
        }
        return cout << 2 * h + 2 * w, 0;
    }
    int p = INF;
    for(int i = 2; i < (int)5e4; i++) {
        int l = 0, r = INF;
        while(r - l > 1) {
            int mid = (r + l) >> 1;
            int ans = mid * (i / 2);
            if(i % 2) ans += mid / 2;
            if(ans >= m) r = mid;
            else l = mid;
        }
        int k = n - (i * r - m * 2);
        int h = i, w = r;
        if(w > h && k > (w - h) * w) {
            h = w;
            k -= (w - h) * w;
        }
        if(w < h && k > (h - w) * h) {
            w = h;
            k -= (h - w) * h;
        }
        while(k > 0) {
            if(h < w) {
                h++;
                k -= w;
            }
            else {
                w++;
                k -= h;
            }
        }
        p = min(p, 2 * w + 2 * h);
        if(r < i) break;
    }
    cout << p;
    return 0;
}