// UUID: 3ac2c2a9-2b9d-431a-91b1-eeef5bdf6472
#include <bits/stdc++.h>
using namespace std;

int main() {
    int db, eredmeny=0;
    long long full_price = 0, avg;
    cin>>db;
    cin>>avg;
    avg=avg*db;
    vector<int> prices(db);

    for (int i = 0; i < db; i++) {
        cin >> prices[i];
        full_price += prices[i];
    }

    if (full_price<avg){
        cout<<'1';
    }
    else if(full_price==avg){
        cout<<'0';
    }
    else{
        long long diff = full_price - avg;
        sort(prices.rbegin(), prices.rend());

        for(;diff>0;++eredmeny){
            diff-=prices[eredmeny]-1;
        }
        cout<<eredmeny;
    }
}