#include<iostream>
using namespace std;
int main ()
{
  int a1,b1,a2,b2,a3,b3,a4,b4,a5,
  b5,a6,b6,a7,b7;
  cin>> a1>>b1;
  cin>> a2>>b2;
  cin>> a3>>b3;
  cin>> a4>>b4;
  cin>> a5>>b5;
  cin>> a6>>b6;
  cin>> a7>>b7;
  int arr1[7]={a1,a2,a3,a4,a5,a6,a7};
  int arr2[7]={b1,b2,b3,b4,b5,b6,b7};
  for(int i=0;i<7;i++)
  {
    if (arr1[i]+arr2[i]>8)
     {
  	cout<<i+1<<endl;
  	return 0;
     }
   }
  cout <<"0"<<endl;
  return 0;
}