import sys
readline=sys.stdin.readline

N=int(readline())
inf=1<<30
dp=[inf]*(10**5+1)
dp[0]=0
for _ in range(N):
    a,b=map(int,readline().split())
    for i in range(10**5,a-1,-1):
        dp[i]=min(dp[i-a],dp[i]+b)
    for i in range(a):
        dp[i]+=b
ans=min(max(i,dp[i]) for i in range(10**5+1))
print(ans)