Problem: You are going out for a walk, when you suddenly encounter N monsters. Each monster has a parameter called health, and the health of the i-th monster is h_i at the moment of encounter. A monster will vanish immediately when its health drops to 0 or below.

Fortunately, you are a skilled magician, capable of causing explosions that damage monsters. In one explosion, you can damage monsters as follows:

* Select an alive monster, and cause an explosion centered at that monster. The health of the monster at the center of the explosion will decrease by A, and the health of each of the other monsters will decrease by B. Here, A and B are predetermined parameters, and A > B holds.



At least how many explosions do you need to cause in order to vanish all the monsters?

Constraints

* All input values are integers.
* 1 ≤ N ≤ 10^5
* 1 ≤ B < A ≤ 10^9
* 1 ≤ h_i ≤ 10^9

Input

Input is given from Standard Input in the following format:


N A B
h_1
h_2
:
h_N


Output

Print the minimum number of explosions that needs to be caused in order to vanish all the monsters.

Examples

Input

4 5 3
8
7
4
2


Output

2


Input

2 10 4
20
20


Output

4


Input

5 2 1
900000000
900000000
1000000000
1000000000
1000000000


Output

800000000

Solution (in JAVA):

Solution:

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.math.BigInteger;
import java.util.*;
import java.util.stream.IntStream;
import java.util.stream.LongStream;
import java.util.stream.Stream;

public class Main {

    public static void main(String[] args) throws IOException {
        new Main().solve();
    }

    private void solve() throws IOException {
        try {
//            solveA();
//            solveB();
//            solveC();
//            solveD();
            solveE();
//            solveF();
        } finally {
            if (in != null) {
                in.close();
            }
            if (out != null) {
                out.flush();
                out.close();
            }
        }

    }

    // mods
    long MOD = (long) Math.pow(10, 9) + 7;

    private void solveA() {
        int n = nextInt();
        int[] l = IntStream.range(0, n).map(i -> nextInt()).sorted().toArray();
        long res = 0;
        for (int i = 0; i < n - 1; i++) {
            res += l[i];
        }
        out.println(res > l[n - 1] ? "Yes" : "No");
    }

    private void solveB() {
        long n = nextLong();
        long max = (long) Math.sqrt(n);
        long res = Long.MAX_VALUE - 1;
        for (long idx = 1; idx <= max; idx++) {
            long i = idx;
            long j = n / idx;
            if (i * j != n)
                continue;
            res = Math.min(res, (i - 1) + (j - 1));
        }
        out.println(res);
    }

    private void solveC() {
        int n = nextInt();
        String[] s = IntStream.range(0, n).mapToObj(i -> next()).toArray(String[]::new);
        long m = 0;
        long a = 0;
        long r = 0;
        long c = 0;
        long h = 0;
        for (String wk : s) {
            switch (wk.charAt(0)) {
                case 'M':
                    m++;
                    break;
                case 'A':
                    a++;
                    break;
                case 'R':
                    r++;
                    break;
                case 'C':
                    c++;
                    break;
                case 'H':
                    h++;
                    break;
                default:
                    break;
            }
        }
        long res = 0;
        res += m * a * r;
        res += m * a * c;
        res += m * a * h;

        res += m * r * c;
        res += m * r * h;

        res += m * c * h;

        res += a * r * c;
        res += a * r * h;

        res += a * c * h;

        res += r * c * h;
        out.println(res);
    }

    private void solveD() {
        int n = nextInt();
        int[][] uvw = Stream.generate(() -> new int[]{nextInt(), nextInt(), nextInt()}).limit(n - 1).toArray(int[][]::new);
        Graph graph = new Graph(uvw);
        int[] res = new int[n];
        Arrays.fill(res, -1);
        res[0] = 0;
        Queue<Integer> queue = new ArrayDeque<Integer>();
        queue.add(1);
        while (!queue.isEmpty()) {
            int cnt = queue.size();
            for (int i = 0; i < cnt; i++) {
                int idx = queue.poll();
                GraphNode node = graph.getNode(idx);
                Map<Integer, Integer> tmp = node.childs;
                for (int next : tmp.keySet()) {
                    if (res[next - 1] != -1)
                        continue;
                    if (tmp.get(next) % 2 == 0)
                        res[next - 1] = res[idx - 1];
                    else
                        res[next - 1] = res[idx - 1] == 0 ? 1 : 0;
                    queue.add(next);
                }
            }
        }

        Arrays.stream(res).forEach(i -> out.println(i));
    }

    private void solveE() {
        int n = nextInt();
        long a = nextLong();
        long b = nextLong();

        long[] h = LongStream.range(0, n).map(i -> nextLong()).sorted().toArray();
        long left = -1;
        long right = h[n - 1];
        //操作回数をにぶたんする
        while (right - left > 1) {
            long mid = left + (right - left) / 2;
            //操作回数midで全てを0以下にすることが可能か
            if (isEnough(h, mid, a, b))
                right = mid;
            else
                left = mid;
        }
        out.println(right);
    }

    private boolean isEnough(long[] h, double t, double a, double b) {
        long count = 0;
        double diff = a - b;
        for (long hi : h) {
            if (hi > b * t)
                //t回、bのダメージを受けた残り体力はdiff何回分なのか？
                count += (long) Math.ceil((hi - b * t) / diff);
        }
        //t以下で0以下にできたか否か
        return count <= t;
    }

    private void solveF() {

    }

    private static class GraphNode {
        private int n;
        private Map<Integer, Integer> childs;

        public GraphNode(int n) {
            this.n = n;
            childs = new HashMap<Integer, Integer>();
        }

        public void addChild(int child, int d) {
            this.childs.put(child, d);
        }
    }

    private static class Graph {

        private Map<Integer, GraphNode> graph;

        public Graph(int[][] list) {
            graph = new HashMap<Integer, GraphNode>();
            Arrays.stream(list).forEach(l -> {
                int a = l[0];
                int b = l[1];
                int d = l[2];
                graph.put(a, graph.getOrDefault(a, new GraphNode(a)));
                graph.get(a).addChild(b, d);
                graph.put(b, graph.getOrDefault(b, new GraphNode(b)));
                graph.get(b).addChild(a, d);
            });
        }

        public GraphNode getNode(int i) {
            return graph.getOrDefault(i, new GraphNode(-1));
        }

    }

    private static class SegTree {
        long e = 0;

        long calcFunc(long a, long b) {
            return a + b;
        }

        int n;
        long nodes[];

        public SegTree(long[] a) {
            init(a);
        }

        public SegTree(int len, long x) {
            long a[] = new long[len];
            Arrays.fill(a, x);
            init(a);
        }

        public SegTree(int len) {
            init(len);
        }

        void init(long[] a) {
            init(a.length);
            for (int i = 0; i < a.length; i++) {
                nodes[i + n - 1] = a[i];
            }
            for (int i = n - 2; i >= 0; i--) {
                nodes[i] = calcFunc(nodes[i * 2 + 1], nodes[i * 2 + 2]);
            }
        }

        void init(int len) {
            n = 1;
            while (n < len) {
                n *= 2;
            }
            nodes = new long[n * 2 - 1];
            Arrays.fill(nodes, e);
            for (int i = n - 2; i >= 0; i--) {
                nodes[i] = calcFunc(nodes[i * 2 + 1], nodes[i * 2 + 2]);
            }
        }

        void set(final int i, long val) {
            int wkI = i + n - 1;
            nodes[wkI] = val;
            while (wkI > 0) {
                wkI = (wkI - 1) / 2;
                nodes[wkI] = calcFunc(nodes[wkI * 2 + 1], nodes[wkI * 2 + 2]);
            }
        }

        long get(int i) {
            return find(i, i + 1);
        }

        /*
       要求区間 [a, b) 中の要素の最小値を答える
       k := 自分がいるノードのインデックス
       対象区間は [l, r) にあたる
        */
        long find(int a, int b) {
            return find(a, b, 0, 0, n);
        }

        long find(int a, int b, int k, int l, int r) {
            if (r < 0)
                r = n;

            if (b <= l || r <= a)
                return e;

            if (a <= l && r <= b)
                return nodes[k];

            long val1 = find(a, b, k * 2 + 1, l, (l + r) / 2);
            long val2 = find(a, b, k * 2 + 2, (l + r) / 2, r);
            //Math.min()
            //今回は区間内の個数なのでSUM
            return val1 + val2;
        }
    }

    private static class UnionFind {
        int[] pars;

        public UnionFind(int n) {
            pars = new int[n + 1];
            Arrays.fill(pars, -1);
        }

        public int getChilds(int n) {
            int wk = getRoot(n);
            return pars[wk];
        }

        public int getRoot(int n) {
            if (pars[n] < 0)
                return n;
            return pars[n] = getRoot(pars[n]);
        }

        public boolean isSame(int a, int b) {
            return getRoot(a) == getRoot(b);
        }

        private int getSize(int a) {
            return -pars[getRoot(a)];
        }

        public void unite(int a, int b) {
            int wkA = getRoot(a);
            int wkB = getRoot(b);
            if (wkA == wkB)
                return;

            if (getSize(wkA) < getSize(wkB)) {
                int tmp = wkA;
                wkA = wkB;
                wkB = tmp;
            }
            pars[wkA] = pars[wkA] + pars[wkB];
            pars[wkB] = wkA;
        }
    }

    public long calcSimpleCombination(long n, long m, long CONST_MOD) {
        long mole = 1;
        for (long i = 1; i <= n + m; i++) {
            mole *= i;
            mole %= CONST_MOD;
        }
        long deno = 1;
        for (long i = 1; i <= n; i++) {
            deno *= i;
            deno %= CONST_MOD;
        }
        for (int i = 1; i <= m; i++) {
            deno *= i;
            deno %= CONST_MOD;
        }
        deno = modInverse(deno, CONST_MOD);
        return (mole * deno) % CONST_MOD;
    }

    long abs(double x) {
        return (long) Math.abs(x);
    }

    long round(double x) {
        return Math.round(x);
    }

    long floor(double x) {
        return (long) Math.floor(x);
    }

    long ceil(double x) {
        return (long) Math.ceil(x);
    }

    double sqrt(double x) {
        return Math.sqrt(x);
    }

    double pow(double x, double y) {
        return Math.pow(x, y);
    }

    long pow(long x, long y) {
        return (long) Math.pow(x, y);
    }

    int gcd(int a, int b) {
        return b == 0 ? a : gcd(b, a % b);
    }

    long gcd(long a, long b) {
        return b == 0 ? a : gcd(b, a % b);
    }

    long lcm(long a, long b) {
        return a * b / gcd(a, b);
    }

    int upperToInt(char a) {
        return a - 'A';
    }

    int lowerToInt(char a) {
        return a - 'a';
    }

    int numToInt(char a) {
        return a - '0';
    }

    int charToInt(char a) {
        return a >= 'a' ? lowerToInt(a) : a >= 'A' ? upperToInt(a) : numToInt(a);
    }

    char intToUpper(int a) {
        return (char) (a + 'A');
    }

    char intToLower(int a) {
        return (char) (a + 'a');
    }

    char intToNum(int a) {
        return (char) (a + '0');
    }

    void reverse(String array[]) {
        String reversed[] = new String[array.length];
        for (int i = 0; i < array.length; i++) {
            reversed[array.length - i - 1] = array[i];
        }
        for (int i = 0; i < array.length; i++) {
            array[i] = reversed[i];
        }
    }

    void reverse(int array[]) {
        int reversed[] = new int[array.length];
        for (int i = 0; i < array.length; i++) {
            reversed[array.length - i - 1] = array[i];
        }
        for (int i = 0; i < array.length; i++) {
            array[i] = reversed[i];
        }
    }

    void reverse(long array[]) {
        long reversed[] = new long[array.length];
        for (int i = 0; i < array.length; i++) {
            reversed[array.length - i - 1] = array[i];
        }
        for (int i = 0; i < array.length; i++) {
            array[i] = reversed[i];
        }
    }

    void reverse(double array[]) {
        double reversed[] = new double[array.length];
        for (int i = 0; i < array.length; i++) {
            reversed[array.length - i - 1] = array[i];
        }
        for (int i = 0; i < array.length; i++) {
            array[i] = reversed[i];
        }
    }

    void reverse(boolean array[]) {
        boolean reversed[] = new boolean[array.length];
        for (int i = 0; i < array.length; i++) {
            reversed[array.length - i - 1] = array[i];
        }
        for (int i = 0; i < array.length; i++) {
            array[i] = reversed[i];
        }
    }

    void fill(int array[], int x) {
        Arrays.fill(array, x);
    }

    void fill(long array[], long x) {
        Arrays.fill(array, x);
    }

    void fill(double array[], double x) {
        Arrays.fill(array, x);
    }

    void fill(boolean array[], boolean x) {
        Arrays.fill(array, x);
    }

    void fill(int array[][], int x) {
        for (int a[] : array) {
            fill(a, x);
        }
    }

    void fill(long array[][], long x) {
        for (long a[] : array) {
            fill(a, x);
        }
    }

    void fill(double array[][], double x) {
        for (double a[] : array) {
            fill(a, x);
        }
    }

    void fill(boolean array[][], boolean x) {
        for (boolean a[] : array) {
            fill(a, x);
        }
    }

    void fill(int array[][][], int x) {
        for (int a[][] : array) {
            fill(a, x);
        }
    }

    void fill(long array[][][], long x) {
        for (long a[][] : array) {
            fill(a, x);
        }
    }

    void fill(double array[][][], double x) {
        for (double a[][] : array) {
            fill(a, x);
        }
    }

    void fill(boolean array[][][], boolean x) {
        for (boolean a[][] : array) {
            fill(a, x);
        }
    }

    long INF = (long) 1e18 + 7;

    boolean isINF(long a) {
        return abs(a) > INF / 1000;
    }

    boolean isPlusINF(long a) {
        return a > 0 && isINF(a);
    }

    boolean isMinusINF(long a) {
        return isPlusINF(-a);
    }

    int I_INF = (int) 1e9 + 7;

    boolean isINF(int a) {
        return abs(a) > I_INF / 1000;
    }

    boolean isPlusINF(int a) {
        return a > 0 && isINF(a);
    }

    boolean isMinusINF(int a) {
        return isPlusINF(-a);
    }

    public long mod(long i) {
        return i % MOD + ((i % MOD) < 0 ? MOD : 0);
    }

    long powMod(long x, long y) {
        if (y == 0) {
            return 1;
        } else {
            long tmp = powMod(x, y / 2);
            return mod(mod(tmp * tmp) * (y % 2 == 0 ? 1 : x));
        }
    }

    long[] powsMod(long x, int max) {
        long pow[] = new long[max + 1];
        pow[0] = 1;
        for (int i = 0; i < max; i++) {
            pow[i + 1] = mod(pow[i] * x);
        }
        return pow;
    }

    long inv(long x) {
        return powMod(x, MOD - 2);
    }

    int MAX_FACT = 5_000_100;
    long fact[];
    long invFact[];

    /**
     * Combination簡易版
     * 5 C 2
     * 異なる n個のものから r個を選ぶ組み合わせの総数 nCr を求めます。
     * 5!(5*4*3*2*1)
     * /
     * 2!(2*1) *  (5-2)!(3*2*1)
     *
     * @param n
     * @param r
     * @return
     */
    private long getComb(int n, int r) {
        long tmp = 1;
        for (int i = 1; i <= r; i++) {
            tmp *= n - i + 1;
            tmp = mod(tmp);
            tmp *= inv(i);
            tmp = mod(tmp);
        }
        return tmp;
    }

    /**
     * 階乗計算の事前累積和
     * [1, 1, 2, 3, 4, 5, … FACTORIAL_NUM]
     * mod済
     */
    void prepareFact() {
        fact = new long[MAX_FACT];
        Arrays.fill(fact, 0);
        invFact = new long[MAX_FACT];
        Arrays.fill(invFact, 0);
        fact[0] = 1;
        int maxIndex = (int) min(MAX_FACT, (int) MOD);
        for (int i = 1; i < maxIndex; i++) {
            fact[i] = mod(fact[i - 1] * i);
        }
        invFact[maxIndex - 1] = inv(fact[maxIndex - 1]);
        for (int i = maxIndex - 1; i > 0; i--) {
            invFact[i - 1] = mod(invFact[i] * i);
        }
    }

    /**
     * 順列
     * nPk -> n! / (n-k)!
     *
     * @param n
     * @param r
     * @return
     */
    long permutation(int n, int r) {
        if (n < 0 || r < 0 || n < r) {
            return 0;
        }
        return mod(fact[n] * invFact[n - r]);
    }

    /**
     * 組み合わせ
     * nCk -> n! / k!・(n-k)!
     *
     * @param n
     * @param r
     * @return
     */
    long combination(int n, int r) {
        if (n < 0 || r < 0 || n < r) {
            return 0;
        }
        return mod(permutation(n, r) * invFact[r]);
    }

    /**
     * 重複組合せ nHr （同次積）
     * nHr = (n+r-1)Cr
     * 異なるn個のものから重複を許してr個取る組合せの総数
     * 例：
     * リンゴ，ミカン，牛肉の3種類の果物があります．これらの中から6個の食材を買って帰ります．
     * このとき，何通りの買い方がありますか？ただし，含まれない食材があってもよいものとします
     *
     * @param n
     * @param r
     * @return
     */
    long homogeneousProduct(int n, int r) {
        return combination((n - 1) + r, r);
    }

    /**
     * 多項係数
     * 文字aをp個,bをq個,cをr個, dをs個 あわせてn個を1列に並べるときの並べ方
     * n! / p!・q!・r!・s!
     *
     * @param n
     * @param strNum
     * @param mod
     * @return
     */

    /**
     * フェルマーの小定理を用いて逆元を求める。
     * ある数xのmod p（pは素数）の逆数x'はx' = x^(p-2)
     * 繰り返し二乗法を用いて計算する。
     * http://satanic0258.hatenablog.com/entry/2016/04/29/004730
     * {@link BigInteger#modInverse(BigInteger)}とどちらが速いか？
     *
     * @param x
     * @return
     */
    private long modInverse(long x, long mod) {
        long res = 1L;
        long k = mod - 2L;
        long y = x;
        while (k != 0) {
            if (k % 2 != 0) {
                res = (res * y) % mod;
            }
            y = (y * y) % mod;
            k /= 2;
        }
        return res;
    }


    private final PrintWriter out = new PrintWriter(System.out);
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;

    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }

    private int readByte() {
        if (hasNextByte())
            return buffer[ptr++];
        else
            return -1;
    }

    private static boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }

    private void skipUnprintable() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
    }

    public boolean hasNext() {
        skipUnprintable();
        return hasNextByte();
    }

    public int nextInt() {
        return Integer.parseInt(next());
    }

    public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }

    public long nextLong() {
        if (!hasNext())
            throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }

    public long min(long... v) {
        long min = Long.MAX_VALUE;
        for (long i : v) min = Math.min(min, i);
        return min;
    }

    public long max(long... v) {
        long max = Long.MIN_VALUE;
        for (long i : v) max = Math.max(max, i);
        return max;
    }
}