import sys
import io, os
input = io.BytesIO(os.read(0,os.fstat(0).st_size)).readline

n = int(input())
VT = []
for i in range(n):
    v, t = map(int, input().split())
    VT.append((v,t))

VT.sort(key=lambda x: x[0]+x[1])
dp = 1
limit = (1<<30000)-1
for v, t in VT:
    mask = (1<<t)-1
    dp |= (dp&mask)<<v
    dp &= limit
l = dp.bit_length()
for i in reversed(range(l)):
    if (dp>>i) & 1:
        print(i)
        exit()