# your code goes here
n = [2,4,7,1,6,3,8,5,10,9,12]
i = 0
j = len(n)-1
p1 = 0
p2 = 0
while(j>=i):
	if(n[i]%2 != 0):
		p1 += n[i]
		i += 1
	
	else:
		p2 += n[i]
		i += 1
		while(n[j]%2 !=0):
			p1 += n[j]
			j -= 1
		p2 += n[j]
		j -= 1

ans = abs(p2-p1)
print(ans)