#include<bits/stdc++.h>
using namespace std;
int main()
{
    int t,n,i,j,x,y,a[100005],b[100005];
    scanf("%d",&t);
    while(t--)
    {
        memset(a,0,sizeof(a));
        memset(b,0,sizeof(b));
        scanf("%d",&n);
        for(i=0;i<n;++i)
        {
            scanf("%d%d",&x,&y);
            if(x==1)a[y]=1;
            else b[y+2]=1;
        }
        int ans;
        for(i=100003;i>=1;i--)
        {
            if(a[i]==1)
            {
                ans=i+1;
                break;
            }
            if(b[i]==1)
            {
                if(a[i-1]==0)ans=i;
                else ans=i+1;
                break;
            }
        }
        printf("%d\n",ans);
    }
}