N=int(input())
L=100000
INF=10**9
dp=[INF]*(L+10**3+10)
dp[0]=0
for _ in range(N):
    a,b=map(int, input().split())
    for w in range(L+1)[::-1]:
        if dp[w]<INF:
            dp[w+a]=min(dp[w],dp[w+a])
            dp[w]+=b
res=INF
for w in range(L+1):
    res=min(res,max(w,dp[w]))
print(res)