#include<stdio.h>
int main()
{
    int school[7],outschool[7];
    int max=0,i=0,ans=0;
    while((scanf("%d %d"),&school[i],&outschool[i])==2)
    {
        if ((school[i]+outschool[i])>max)
        {
            max=school[i]+outschool[i];
            ans=i+1;
        }
        i++;
    }
    if(max>8)
    printf("%d",ans);
    else
    printf("0");
    return 0;
}