N = int(input())

inf = float("inf")
dp = [inf] * (N*1000+1)
dp[0] = 0

for i in range(N):
    ndp = [inf] * len(dp)
    A,B = map(int,input().split())
    for j in range(len(dp)-1,-1,-1):
        if dp[j] == inf:
            continue
        ndp[j+A] = min(ndp[j+A], dp[j])
        ndp[j] = min(ndp[j], dp[j] + B)
    dp = ndp

ans = float("inf")
for i in range(len(dp)):
    ans = min(ans, max(i,dp[i]))
print (ans)