def main():
    N = int(input())
    Y = list(map(int, input().split()))
    
    dp = [0] * (10 ** 4 + 1)
    
    for i in range(N):
        t = float('inf')
        for j in range(10 ** 4 + 1):
            t = min(t, dp[j])
            dp[j] = t + abs(Y[i] - j)
    
    print(min(dp))
main()