b=int(input())
n=int(input())
c=[int(input()) for i in range(n)]
c.sort()
if n//2==1:
  t=c[n//2]
else:
  t=(c[n//2-1]+c[n//2])//2
ans=[]
for i in range(max(t-10**6,0),t+10**6):
  ct=0
  y=b
  for j in range(n):
    if c[j]>=i:
      ct+=c[j]-i
      y+=c[j]-i
  for j in range(n):
    if c[j]<i:
      ct+=i-c[j]
      y-=i-c[j]
  if y>=0:
    ans.append(ct)
print(min(ans))