n = int(input())

inf = 1 << 60
ma = 10 ** 5
dp = [inf] * (ma + 1)
dp[0] = 0
for _ in range(n):
    a, b = map(int, input().split())
    ndp = [inf] * (ma + 1)
    for i in range(a, ma + 1):
        ndp[i] = min(ndp[i], dp[i - a])
    for i in range(ma + 1):
        ndp[i] = min(ndp[i], dp[i] + b)
    dp = ndp

ans = 1 << 60
for i in range(ma + 1):
    ans = min(ans, max(i, dp[i]))
print(ans)