import sys
readline=sys.stdin.readline

N=int(readline())
A,B=[],[]
for _ in range(N):
    a,b=map(int,readline().split())
    b-=a
    A.append(a)
    B.append(b)
inf=1<<30
dp=[[inf]*N for bit in range(1<<N)]
for i in range(N):
    dp[1<<i][i]=0
for bit in range(1<<N):
    lst=[i for i in range(N) if bit&1<<i]
    l=len(lst)
    for j in range(l):
        for i in range(j):
            x,y=lst[i],lst[j]
            if bit&1<<x and bit&1<<y:
                dp[bit][x]=min(dp[bit][x],max(dp[bit^1<<x][y],B[y]+A[x]))
                dp[bit][y]=min(dp[bit][y],max(dp[bit^1<<y][x],B[x]+A[y]))
ans=min(dp[-1])
print(ans)