import sys
input=lambda:sys.stdin.readline().rstrip()
N=int(input())
Y=list(map(int,input().split()))
dp=[[0 for i in range(10001)] for j in range(N)]
for i in range(10001):
	dp[0][i]=max(0,Y[0]-i)
for i in range(1,N):
	dp[i][0]=dp[i-1][0]+Y[i]
	for j in range(1,10001):
		dp[i][j]=min(dp[i][j-1],abs(Y[i]-j)+dp[i-1][j])
print(dp[N-1][10000])