#include <fstream>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;

int main() {
    ios::sync_with_stdio(false); // THE FEELING WHEN
    cin.tie(nullptr); // YOU HAVE KNEE SURGERY TOMORROW

    float N, K; float M = 0;
    cin >> N >> K;

    vector<float> P(N);
    for (int i = 0; i < N; ++i) {
        cin >> P[i];
        M += P[i];
    }
    int rans = 0;
    sort(P.begin(), P.end());
    if (ceil(M / N) < K)
    {
        rans = 1;
    }
    while (ceil(M / N) > K)
    {
        M -= (P[P.size() - 1] - 1);
        rans++;
        P.pop_back();
    }
    cout << int(rans) << endl;

    return 0;
}