import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

class SegmentTree(object):
	def __init__(self, N):
		self.N = N
		self.N0 = 2 ** (N - 1).bit_length()
		self.initVal = INF
		self.data = [self.initVal] * (2 * self.N0)

	def calc(self, a, b):
		return min(a, b)

	def initialize(self, A):
		for i in range(self.N):
			self.data[self.N0 - 1 + i] = A[i]
		for i in range(self.N0 - 2, -1, -1):
			self.data[i] = self.calc(self.data[2 * i + 1], self.data[2 * i + 2])

	def update(self, k, x):
		k += self.N0 - 1
		self.data[k] = x
		while k > 0:
			k = (k - 1) // 2
			self.data[k] = self.calc(self.data[2 * k + 1], self.data[2 * k + 2])

	def query(self, l, r):
		L = l + self.N0; R = r + self.N0 + 1
		m = self.initVal
		while L < R:
			if R & 1:
				R -= 1
				m = self.calc(m, self.data[R - 1])
			if L & 1:
				m = self.calc(m, self.data[L - 1])
				L += 1
			L >>= 1; R >>= 1

		return m

#処理内容
def main():
	N = int(input())
	Y = getlist()
	Seg = SegmentTree(1001)
	for i in range(Y[0] + 1):
		Seg.update(i, Y[0] - i)

	for i in range(1, N):
		DP = [INF] * 1001
		y = Y[i]
		for j in range(1001):
			DP[j] = Seg.query(0, j) + abs(y - j)
		# print(DP)

		Seg.initialize(DP)

	ans = Seg.query(0, 1001)
	print(ans)

if __name__ == '__main__':
	main()