import sys
input = sys.stdin.readline

N=int(input())

DP=[10**8]*100001
DP[0]=0

for i in range(N):
    a,b=map(int,input().split())
    NDP=[10**8]*100001

    for i in range(100001):
        NDP[i]=min(NDP[i],DP[i]+b)
        if i+a<100001:
            NDP[i+a]=min(NDP[i+a],DP[i])

    DP=NDP

ANS=100000000
for i in range(100001):
    ANS=min(ANS,max(i,DP[i]))

print(ANS)