Problem: Kleofáš is participating in an n-thlon - a tournament consisting of n different competitions in n different disciplines (numbered 1 through n). There are m participants in the n-thlon and each of them participates in all competitions.

In each of these n competitions, the participants are given ranks from 1 to m in such a way that no two participants are given the same rank - in other words, the ranks in each competition form a permutation of numbers from 1 to m. The score of a participant in a competition is equal to his/her rank in it.

The overall score of each participant is computed as the sum of that participant's scores in all competitions.

The overall rank of each participant is equal to 1 + k, where k is the number of participants with strictly smaller overall score.

The n-thlon is over now, but the results haven't been published yet. Kleofáš still remembers his ranks in each particular competition; however, he doesn't remember anything about how well the other participants did. Therefore, Kleofáš would like to know his expected overall rank.

All competitors are equally good at each discipline, so all rankings (permutations of ranks of everyone except Kleofáš) in each competition are equiprobable.

Input

The first line of the input contains two space-separated integers n (1 ≤ n ≤ 100) and m (1 ≤ m ≤ 1000) — the number of competitions and the number of participants respectively.

Then, n lines follow. The i-th of them contains one integer xi (1 ≤ xi ≤ m) — the rank of Kleofáš in the i-th competition.

Output

Output a single real number – the expected overall rank of Kleofáš. Your answer will be considered correct if its relative or absolute error doesn't exceed 10 - 9.

Namely: let's assume that your answer is a, and the answer of the jury is b. The checker program will consider your answer correct, if <image>.

Examples

Input

4 10
2
1
2
1


Output

1.0000000000000000


Input

5 5
1
2
3
4
5


Output

2.7500000000000000


Input

3 6
2
4
2


Output

1.6799999999999999

Note

In the first sample, Kleofáš has overall score 6. Nobody else can have overall score less than 6 (but it's possible for one other person to have overall score 6 as well), so his overall rank must be 1.

Solution (in JAVA):

Solution:
import java.io.*;
import java.util.StringTokenizer;

/**
 * Created by sbabkin on 9/14/2015.
 */
public class SolverC {

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

    BufferedReader br;
    PrintWriter pw;
    StringTokenizer stok;

    private String nextToken() throws IOException {
        while (stok == null || !stok.hasMoreTokens()) {
            stok = new StringTokenizer(br.readLine());
        }
        return stok.nextToken();
    }

    private int nextInt() throws IOException {
        return Integer.parseInt(nextToken());
    }

    private long nextLong() throws IOException {
        return Long.parseLong(nextToken());
    }

    private double nextDouble() throws IOException {
        return Double.parseDouble(nextToken());
    }

    private void Run() throws IOException {
//        br = new BufferedReader(new FileReader("input.txt"));
//        pw = new PrintWriter("output.txt");
        br=new BufferedReader(new InputStreamReader(System.in));
        pw=new PrintWriter(new OutputStreamWriter(System.out));

        solve();
        pw.flush();
        pw.close();
    }

    double[] curPoss;
    double[] prefSum;
    int[] pls;
    int n, m;


    private void solve() throws IOException {
        n = nextInt();
        m = nextInt();
        if (m==1) {
            pw.println(1);
            return;
        }
        int resSum = 0;
        pls = new int[n];
        for (int i = 0; i < n; i++) {
            pls[i] = nextInt();
            resSum += pls[i];
        }
        curPoss = new double[m * n + 1];
        prefSum = new double[m * n + 1];
        curPoss[0] = m - 1;
//        double summ = 0;
//        for (int i = 1; i <= m; i++) {
//            if (i != pls[0]) {
//                summ++;
//                curPoss[i] = 1;
//            }
//        }
        for (int i = 0; i < n; i++) {
//            curPoss[0] = curPoss[0] / summ;
            prefSum[0] = curPoss[0];
            for (int z = 1; z <= m * n; z++) {
//                curPoss[z] = curPoss[z] / summ;
                prefSum[z] = curPoss[z] + prefSum[z - 1];
            }
            double[] nextPoss = new double[m * n + 1];
//            double nextSumm = 0;
            for (int j = 1; j <= m * n; j++) {
                double val = getPoss(i, j) / (m - 1);
//                nextSumm += val;
                nextPoss[j] = val;
            }

//            summ = nextSumm;
            curPoss = nextPoss;
        }
//        curPoss[0] = curPoss[0] / summ;
//        for (int z = 1; z <= m * n; z++) {
//            curPoss[z] = curPoss[z] / summ;
//        }
//        double p1 = 0;
//        for (int i = 0; i < resSum; i++) {
//            p1 += curPoss[i];
//        }
//        double p2 = 1 - p1;
//        for (int i = resSum+1; i <=n*m; i++) {
//            p2+=curPoss[i];
//        }
//        if (p1==0) {
//            pw.println("1.0");
//            return;
//        }
//        double curPoss = 1;
//        for (int i = 0; i < m; i++) {
//            curPoss *= p2;
//        }
//        double result = calcPoss(1, p1, p2, curPoss);
//        for (int i=1; i<=m; i++) {
//            result += curPoss*i;
//            curPoss*=p1;
//            curPoss/=p2;
//        }
        double result=1;
        for (int i=0; i<resSum; i++) {
            result+=curPoss[i];
        }
        pw.println(result);
    }

    private double calcPoss(int dep, double p1, double p2, double curPoss) {
        double result = 0;
        result = dep * curPoss;
        //result += calcPoss(dep+1, p1, p2, )
        return result;
    }

    private double getPoss(int numComp, int targ) {
        double result = prefSum[targ - 1];
        if (targ - m - 1 >= 0) {
            result -= prefSum[targ - m - 1];
        }
        if (targ - pls[numComp] >= 0) {
            result -= curPoss[targ - pls[numComp]];
        }
        return result;
    }

}