C++ :

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
	//freopen("unhappy.in","r",stdin);
	//freopen("unhappy.out","w",stdout);
	int flag=-1,my_max=-1,a,b;
	for(int i=1;i<=7;++i)
	{
		cin>>a>>b;
		if(a+b>my_max)
		{
			my_max=a+b;
			flag=i;
		}
	}
	if(my_max>8)cout<<flag<<endl;
	else cout<<0<<endl;
	return 0;
}