#include <stdio.h>
#include <math.h>
 
typedef struct {
    int x, y;
} Point;
 
int main() {
    int err, n;
    scanf("%d", &err); // Read error tolerance
    scanf("%d", &n);   // Read number of hide sites
 
    Point target; // Read target coordinates
    scanf("%d %d", &target.x, &target.y);
 
    Point hide_sites[n]; // Read hide site coordinates
    for (int i = 0; i < n; ++i) {
        scanf("%d %d", &hide_sites[i].x, &hide_sites[i].y);
    }
 
    int best_hide_site = -1; // Initialize the best hide site index
    int min_error = 2000;    // Initialize the minimum error to a value greater than the allowed error
 
    // Iterate through hide sites and find the one with minimum error
    for (int i = 0; i < n; ++i) {
        int distance_squared = (hide_sites[i].x - target.x) * (hide_sites[i].x - target.x) +
                               (hide_sites[i].y - target.y) * (hide_sites[i].y - target.y);
        int error = sqrt(distance_squared);
 
        // If the error is within the allowed tolerance and less than the minimum error, update the best hide site
        if (error <= err && error < min_error) {
            min_error = error;
            best_hide_site = i;
        }
    }
 
    // If a suitable hide site is found, print its index
    if (best_hide_site != -1) {
        printf("%d\n", best_hide_site);
    } else {
        // If no suitable hide site is found, print 'abort'
        printf("abort\n");
    }
 
    return 0;
}
 

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1561768 1486652
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1563789 1488357
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1563187 1486786
1563547 1487697
1564567 1488194
1561796 1488193