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())
    prev=dp
    dp=[inf]*(10**5+1)
    for i in range(10**5+1):
        if i>=a:
            dp[i]=min(prev[i-a],prev[i]+b)
        else:
            dp[i]=prev[i]+b
ans=min(max(i,dp[i]) for i in range(10**5+1))
print(ans)