N, = map(int, input().split())
X = list(map(int, input().split()))
M = max(X)
dp = [[0]*(M+1) for _ in range(N+1)]
for i in range(1, N+1):
    mnr = 10**18
    for j in range(M+1):
        dp[i][j] = min(mnr, dp[i-1][j]+abs(j-X[i-1]))
        mnr = min(dp[i][j], mnr)
print(min(dp[-1]))