#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}
struct clothes
{
    int c,p;
    clothes(){}
    clothes(int _c,int _p)
    {
        c=_c;
        p=_p;
    }
};
bool cmp(clothes c1,clothes c2)
{
    return c1.p>c2.p;
}
const int maxn=52;
const int maxx=125002;
const int maxc=1e7+2;
int n,x[maxn];
int ans;
clothes cl[maxn][maxx];
int used[maxc];
void read()
{
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>x[i];
        for(int j=1;j<=x[i];j++)
        {
            cin>>cl[i][j].c>>cl[i][j].p;
        }
    }
}
void rec(int pos,int sum,int used[])
{
    if(pos>n)
    {
        if(sum>ans)ans=sum;
        return;
    }
    for(int i=1;i<=x[pos];i++)
    {
        if(!used[cl[pos][i].c])
        {
            used[cl[pos][i].c]=1;
            rec(pos+1,sum+cl[pos][i].p,used);
            used[cl[pos][i].c]=0;
        }
    }
}
void solve()
{
    rec(1,0,used);
    cout<<ans<<"\n";
}
int main()
{
    freopen("clothes.in","r",stdin);
    freopen("clothes.out","w",stdout);
    speed();
    read();
    solve();

    return 0;
}