package luogu.part2;

import java.util.Scanner;

public class demo09 {

    public static int happy(int[][] time){
        for (int i=0;i<7;i++){
            int sum=0;
            for(int j=0;j<2;j++){
                sum+=time[i][j];
                if(sum>8){
                    return i+1;
                }
            }
        }
        return 0;
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[][] time = new int[7][2];
        for (int i =0;i<7;i++){
            for (int j=0;j<2;j++)
            {
                time[i][j]=sc.nextInt();
            }
        }
        sc.close();
        int result =happy(time);
        System.out.println(result);

    }
}