#include<stdio.h>intmain(){int n, i =0, a[7], b[7], ans =0, c[7], d[7], max, panduan, k;for(n =0; n <7; n++)scanf("%d%d",&a[n],&b[n]);for(n =0; n <7; n++){
c[n]= a[n]+ b[n];
c[n]-=6;if(c[n]<0)
c[n]=0;if(c[n]> i){
i = c[n];
ans = n +1;}}printf("%d\n", ans);return0;}