import sys

def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
inf = (1 << 31)-1

def main():
    n = II()
    ab = LLI(n)

    dp = [[inf]*(1 << n) for _ in range(n)]
    for i in range(n): dp[i][1 << i] = 0

    def chmin(i, s, val):
        if val < dp[i][s]: dp[i][s] = val

    for s in range(1, 1 << n):
        for i, (ai, bi) in enumerate(ab):
            pre = dp[i][s]
            for j, (aj, bj) in enumerate(ab):
                if s >> j & 1: continue
                chmin(j, s | 1 << j, max(pre, bi+aj-ai))

    ans = min(dp[i][-1] for i in range(n))
    print(ans)

main()