#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000000000
	

int main(){	
	
	long long B;
	cin>>B;
	int N;
	cin>>N;
	
	vector<long long> c(N);
	rep(i,N)cin>>c[i];
	long long ans = Inf;
	rep(i,N){
		long long b = B;
		long long temp = 0;
		rep(j,N){
			if(c[j]>c[i]){
				temp += abs(c[j]-c[i]);
				b += abs(c[j]-c[i]);
			}
		}
		rep(j,N){
			if(c[j]<c[i]){
				temp += abs(c[i]-c[j]);
				b -= abs(c[j]-c[i]);
			}
		}
		if(b<0)continue;
		ans = min(ans,temp);
	}
	cout<<ans<<endl;
	
	return 0;
	
}