n = int(input())
a = list(map(int,input().split()))
mx = max(a)
dp = [[10**18 for i in range(mx+1)] for j in range(n+1)]
for i in range(1,n+1):
    x = a[i-1]
    mn = 10**18
    for j in range(mx+1):
        mn = min(mn,dp[i-1][j])
        dp[i][j] = mn+abs(x-j)
print(min(dp[-1]))