import java.util.Scanner;

public class Main {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.next());
        int t = Integer.parseInt(sc.next());
        int a = Integer.parseInt(sc.next());
        Integer[] h = new Integer[n];
        for (int i = 0; i < n; i++) {
            h[i] = Integer.parseInt(sc.next());
        }

        Double[] temperature = new Double[n];
        double min = 100000.0;
        int result = 0;
        for (int i = 0; i < n; i++) {
            temperature[i] = ((double) t - (h[i] * 0.006));
            double difference = Math.abs((double) a - temperature[i]);
            if (min > difference) {
                min = difference;
                result = i + 1;
            }
        }

        System.out.println(result);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz