#include <bits/stdc++.h>
using namespace std;

#define repu(i, begin, end) for (__typeof(begin) i = (begin) - ((begin) > (end)); i != (end) - ((begin) > (end)); i += 1 - 2 * ((begin) > (end)))
#define repe(i, begin, end) for (__typeof(begin) i = (begin); i != (end) + 1 - 2 * ((begin) > (end)); i += 1 - 2 * ((begin) > (end)))
#define mem(a, x) memset(a, x, sizeof(a))
#define all(a) a.begin(), a.end()
#define count_bits(x) __builtin_popcount(x)
#define count_bitsll(x) __builtin_popcountll(x)
#define least_bits(x) __builtin_ffs(x)
#define least_bitsll(x) __builtin_ffsll(x)
#define most_bits(x) 32 - __builtin_clz(x)
#define most_bitsll(x) 64 - __builtin_clz(x)

vector<string> split(const string &s, char c) {
	vector<string> v;
	stringstream ss(s);
	string x;
	while (getline(ss, x, c)) v.push_back(x);
	return v;
}

#define error(args...) { vector<string> _v = split(#args, ','); err(_v.begin(), args); }

void err(vector<string>::iterator it) {}

template<typename T, typename... Args>
void err(vector<string>::iterator it, T a, Args... args) {
	cerr << it -> substr((*it)[0] == ' ', it -> length()) << " = " << a << '\n';
	err(++it, args...);
}

typedef long long ll;
const int MOD = 1000000007;

template<class T> inline T tmin(T a, T b) {return (a < b) ? a : b;}
template<class T> inline T tmax(T a, T b) {return (a > b) ? a : b;}
template<class T> inline void amax(T &a, T b) {if (b > a) a = b;}
template<class T> inline void amin(T &a, T b) {if (b < a) a = b;}
template<class T> inline T tabs(T a) {return (a > 0) ? a : -a;}
template<class T> T gcd(T a, T b) {while (b != 0) {T c = a; a = b; b = c % b;} return a;}

const int N = 15;
int n;
ll B, C[N];

inline ll get(int l, int r) {
    ll ret = 0;
    repu(i, l, r + 1) ret += C[i];
    return ret;
}

int main(int argc, char *argv[]) {
    ios_base::sync_with_stdio(false);
    cin >> B >> n;
    repu(i, 0, n) {
        cin >> C[i];
    }
    sort(C, C + n);
    ll tot = get(0, n - 1);
    ll maxi = (tot + B) / n;
    ll ret = tot - n * C[0];
    if (C[n - 1] <= maxi) amin(ret, n * C[n - 1] - tot);
    repu(i, 0, n - 1) {
        if (C[i] > maxi) break;
        if (i * 2 + 2 - n >= 0) amin(ret, (i * 2 + 2 - n) * C[i] + get(i + 1, n - 1) - get(0, i));
        else amin(ret, (i * 2 + 2 - n) * tmin(maxi, C[i + 1]) + get(i + 1, n - 1) - get(0, i));
    }
    printf("%lld\n", ret);

    return 0;
}