n = int(input())
Y = tuple(map(int, input().split()))
U = 2*10**4
dp = [[0]*(U+1) for _ in range(n+1)]
for i, y in enumerate(Y):
    temp = float("inf")
    for j in range(U+1):
        k = j-10**4
        temp = min(temp, dp[i][j])
        dp[i+1][j] = temp + abs(y-k)
ans = min(dp[n])
print(ans)