#include <bits/stdc++.h>

using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()

template<typename A, typename B> inline bool chmax(A &a, B b) { if (a<b) { a=b; return 1; } return 0; }
template<typename A, typename B> inline bool chmin(A &a, B b) { if (a>b) { a=b; return 1; } return 0; }

typedef unsigned long long ull;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, pii> P;

const ll INF = 1ll<<29;
const ll MOD = 1000000007;
const double EPS  = 1e-10;

int n, m;
int d[1123];

int main() {
	cin >> n >> m;
	REP(i, m) scanf("%d", d + i);
	sort(d, d + m);
	
	ll ans = INF;
	
	REP(i, m - n + 1) {
		int ld = 0, rd = 0;
		if (d[i] < 0) ld = -d[i];
		if (d[i + n - 1] > 0) rd = d[i + n - 1];
		
		chmin(ans, ld + rd + min(ld, rd));
	}
	
	cout << ans << endl;
	
	return 0;
}