import sys
input = lambda : sys.stdin.readline().rstrip()

sys.setrecursionlimit(2*10**5+10)
write = lambda x: sys.stdout.write(x+"\n")
debug = lambda x: sys.stderr.write(x+"\n")
writef = lambda x: print("{:.12f}".format(x))


n = int(input())
vt = [tuple(map(int, input().split())) for _ in range(n)]
vt.sort(key=lambda item: item[0]+item[1])
dp = 1
mask0 = (1<<30000)-1
for v,t in vt:
    # t未満のところはv増やせる
    mask = (1<<t) - 1
    dp = dp | (dp&mask)<<v
    dp &= mask0
for i in range(dp.bit_length())[::-1]:
    if dp>>i&1:
        ans = i
        break
print(ans)