N = int(input())
Y = list(map(int,input().split()))
import sys
if N == 1:
    print(0)
    exit()

C = 10 ** 4
inf = 10 ** 10
dp = [[inf] * (C+1) for _ in range(N)]
for i in range(C+1):
    dp[0][i] = abs(i-Y[0])
for i in range(N-1):
    _min = inf
    for j in range(C+1):
        _min = min(_min,dp[i][j])
        dp[i+1][j] = _min + abs(j - Y[i+1])
print(min(dp[-1]))