import sys
input = sys.stdin.readline

N = int(input())
Y = list(map(int, input().split()))
dp = [[0]*(10**4+1) for _ in range(N+1)]

for i in range(N):
    acc = [10**18]
    
    for j in range(10**4+1):
        acc.append(min(acc[-1], dp[i][j]))
    
    for j in range(10**4+1):
        dp[i+1][j] = acc[j+1]+abs(Y[i]-j)
    
print(min(dp[N]))