import sys

readline = sys.stdin.readline
readall = sys.stdin.read
ns = lambda: readline().rstrip()
ni = lambda: int(readline().rstrip())
nm = lambda: map(int, readline().split())
nl = lambda: list(map(int, readline().split()))
prn = lambda x: print(*x, sep='\n')

def solve():
    n = ni()
    m = 10**4 + 1
    l = nl()
    prv = [0]*m
    nxt = [0]*m
    for x in l:
        cur = prv[0]
        for i in range(m):
            cur = min(cur, prv[i])
            nxt[i] = abs(i - x) + cur
        prv, nxt = nxt, prv
    print(min(prv))
    return

solve()