from collections import *
from itertools import *
from functools import *
from heapq import *
import sys,math
input = sys.stdin.readline

N = int(input())
AB = [tuple(map(int,input().split())) for _ in range(N)]

ide_ele = -float('inf')

M = N*max(a for a,b in AB)
Sb = sum(b for a,b in AB)
val = [ide_ele]*(M+1)
val[0] = 0
for a,b in AB:
    
    for j in range(M,a-1,-1):
        
        val[j] = max(val[j],val[j-a]+b)
        
ans = min(max(a,Sb - val[a]) for a in range(M+1))
print(ans)