#include <stdio.h>
#include <stdlib.h>
#include <conio.h>

int main() {

    int i, n, a, b, mi, ma, mb;
    FILE* fin = fopen("profit.in", "r");
    FILE* fout = fopen("profit.out", "w");

    mi = 0;
    ma = -1;
    mb = 1;

    fscanf(fin, "%d", &n);

    for (i = 0; i < n; i++) {

        fscanf(fin, "%d %d", &a, &b);

        if ( a*mb > b*ma ) {

            ma = a;
            mb = b;
            mi = i+1;
        }
    }

    fprintf(fout, "%d", mi);

    return 0;
}