n=int(input());m=10**4+1
a=list(map(int,input().split()))
dp=[0]*m
for i in a:
    dp2=[1<<60]*m
    c=1<<60
    for j in range(m):
        c=min(c,dp[j])
        dp2[j]=c+abs(j-i)
    dp=dp2
print(min(dp))