N = int(input())
lsAB = [tuple(map(int,input().split())) for i in range(N)]
inf = float('INF')
dp = [inf]*(10**5+1)
dp[0] = 0
for i in range(N):
    dp2 = [inf]*(10**5+1)
    A,B = lsAB[i]
    for j in range(10**5+1):
        if j+A <= 10**5:
            dp2[j+A] = dp[j]
    for j in range(10**5+1):
        dp2[j] = min(dp2[j],dp[j]+B)
    dp = dp2
ans = inf
for i in range(10**5+1):
    ans = min(ans,max(i, dp[i]))
print(ans)