#include <stdio.h>

int main()

{

    while()

    {

        int i, n;

        int maxday, maxvalue = -;

        scanf("%d", &n);

        if (n == ) break;

        for (i = ; i <= n; i++)

        {

            int a, b;

            scanf("%d%d", &a, &b);

            if (a + b > maxvalue)

            {

                maxvalue = a + b;

                maxday = i;

            }

        }

        if (maxvalue <= ) printf("0\n");

        else printf("%d\n", maxday);

    }

    return ;

}