#include<iostream>
using namespace std;
int main()
{
    int cnt = 0;
    for(int i = 0; i <= 7; i++)
    {
        int a, b;
        cin >> a >> b;
        if(a + b > 8){
            cnt = i + 1;
            break;
        }
    }

    cout << cnt << endl;
    return 0;
}