b = int(input())
n = int(input())
c = [int(input()) for _ in range(n)]

def func(target):
    add = 0
    remove = 0
    for x in c:
        if x < target:
            add += target - x
        else:
            remove += x - target
 
    return add + remove

ans = float('inf')
for target in range(min(c), max(c) + 1):
    ans = min(ans, func(target))

print(ans)