N = int(input())
Y = list(map(int,input().split()))

MX = 10001
dp = [0] * (MX+1)
mn = [0] * (MX+1)
for y in Y:
    dp2 = [0] * (MX+1)
    for i in range(MX+1):
        dp2[i] = mn[i] + abs(y-i)
    dp = dp2
    mn[0] = dp[0]
    for i in range(1,MX+1):
        mn[i] = min(dp[i], mn[i-1])
print(min(dp))