#include <iostream>
#include<iomanip>
#include<cmath>
#include<algorithm>
using namespace std;
int main()
{
    int x[7], m[7];
    int result[7];
    int a = 0, b = 0;
    for (int i = 0; i < 7; i++)
    {   
        cin >> x[i] >> m[i];   
        result[i] = x[i] + m[i];
        if (i == 0)
            a = result[i], b = i + 1;
        else if (result[i] > a)
            a = result[i], b = i + 1;
        else if (result[i] <= a)
            a = a, b = b;
    }
    cout << b << endl;
    return 0;
}