def sorted_subsetsum(a):
    A = [0]
    for ai in a:
        A *= 2
        for i in range(len(A)//2): A[i] += ai
        A.sort()
    return A

n = int(input())
v = 0
r = [0]*n
for i in range(n):
    a,b = map(int,input().split())
    r[i] = a+b
    v += b
p = sorted_subsetsum(r[:n//2])
q = sorted_subsetsum(r[n//2:])

ans = 1<<60
idx = len(q)-1
q.append(0)
for pi in p:
    while idx and pi+q[idx] >= v:
        idx -= 1
    ans = min(ans,abs(v-pi-q[idx]),abs(v-pi-q[idx+1]))
print(ans)