#include<stdio.h>
int main()
{
    int school_time,extra_time,total_time,max_time=0,max_day=0;
    for(int day = 1;day <= 7;day++)
    {
        scanf("%d %d",&school_time,&extra_time);
        total_time = school_time+extra_time;
            if(total_time>8 && total_time>max_time)
            {
                max_time=total_time;
                max_day=day;
            }
    }
    printf("%d",max_day==0?0:max_day);
    return 0;
}