N = int(input())
Y = [int(y) for y in input().split()]

M = max(Y)
dp = [[0]*(M+1) for _ in range(N)]

for j in range(M+1):
    dp[0][j] = abs(j-Y[0])

for i in range(1, N):
    m = dp[i-1][0]
    for j in range(M+1):
        m = min(m, dp[i-1][j])
        dp[i][j] = m + abs(Y[i]-j)

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