> #include <iostream>
> #include <cstdio>
> 
> using namespace std;
> typedef long long ll;
> 
> struct MM
> {
>     ll x;
>     ll y;
> }s[50050];
> 
> int main()
> {
>     int _;
>     ll sum=0;
>     cin>>_;
>     for(int i=0;i<_;i++)
>     {
>         scanf("%lld %lld",&s[i].x,&s[i].y);
>         sum+=s[i].x;
>     }
>     ll ans=sum;
>     for(int i=0;i<_;i++)
>     {
>         ans=min(ans,sum-s[i].x-s[i].y);
>     }
>     cout<<ans<<endl;
>     return 0;
> }