INF = float('inf')

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

a = sorted(set(Y))
maxY = max(Y)

dp = [[INF] * len(a) for _ in range(N)]

for i in range(len(a)):
    dp[0][i] = abs(Y[0] - a[i])

for i in range(1, N):
    for j in range(len(a)):
        for k in range(j + 1):
            dp[i][j] = min(dp[i][j], dp[i - 1][k] + abs(Y[i] - a[j]))

print(min(dp[N - 1]))