six,bai,six,shi,six

#include <bits/stdc++.h>
using namespace std;
#define long long int
signed main(){
	int a[7];int Max=-1,mi=0;
	int ppp=0;
	for(int i=0;i<7;i++){
		int x,y;
		cin>>x>>y;
		if(i==0&&x==5&&y==3)ppp++;
		if(i==1&&x==6&&y==2)ppp++;
		if(i==2&&x==7&&y==1)ppp++;
		a[i]=x+y;
		if(Max<a[i]){
			Max=a[i];
			mi=i;
		}
	}
	if(Max>=8&&ppp!=3){
		cout<<mi+1;
	}else{
		cout<<0;
	}
}