import sys
input = sys.stdin.readline

N=int(input())

A=[]

for i in range(N):
    x,y=map(int,input().split())
    A.append((x,y-x))

DP=[[1<<60]*N for i in range(1<<N)]

for i in range(N):
    DP[1<<i][i]=0

for i in range(1<<N):
    for j in range(N):
        for to in range(N):
            if i & (1<<to) != 0:
                continue

            b=i|(1<<to)

            DP[b][to]=min(DP[b][to],max(DP[i][j],A[j][1]+A[to][0]))

ANS=1<<60

for i in range(N):
    ANS=min(ANS,DP[-1][i])

print(ANS)