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 = (2 ** 30000) - 1
for v, t in vt:
    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)