n=int(input())
c=[]
for i in range(n):
	a,b=map(int,input().split())
	c+=[(a,-b)]
X=10**20
g=X
if n<=16:
	for i in range(1<<n):
		p=0
		for j in range(n):
			p+=c[j][(i>>j)&1]
		g=min(g,abs(p))
else:
	pl=[]
	for i in range(1<<(n//2)):
		p=0
		for j in range(n//2):
			p+=c[j][(i>>j)&1]
		pl+=[p]
	pl.sort()
	pr=[-X,X]
	for i in range(1<<(n-n//2)):
		p=0
		for j in range(n-n//2):
			p+=c[n//2+j][(i>>j)&1]
		pr+=[p]
	pr.sort()
	from bisect import bisect_left
	for v in pl:
		y=bisect_left(pr,-v)
		g=min(g,abs(v+pr[y]),abs(v+pr[y-1]))
print(g)