import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        @SuppressWarnings("resource")
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int t = sc.nextInt();
        int a = sc.nextInt();
        int[] h = new int[n];
        for (int i = 0 ; i < n ; i++) {
            h[i] = sc.nextInt();
        }
        double min = Double.MAX_VALUE;
        int ans = 0;
        for (int i = 0 ; i < n ; i++) {
           if (min > Math.abs(a - (t - 0.006 * h[i]))) {
               ans = i + 1;
               min = Math.abs(a - (t - 0.006 * h[i]));
           }
        }
        System.out.println(ans);
    }

}

/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