N = int(input())
N2 = 10 ** 3 * N + 1
dp = [N2] * N2
dp[0] = 0

for _ in range(N):
    a,b = map(int,input().split())
    dp2 = [N2] * N2
    for i in reversed(range(N2 - a)):
        dp2[i+a] = min(dp2[i+a],dp[i])
        dp2[i] = min(dp2[i],dp[i]+b)
    dp = dp2
ans = N2
for i in range(N2):
    ans = min(ans,max(i,dp[i]))
print(ans)