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());

        double[] arr = new double[n]; //aとの差

        for (int i = 0; i < n; i++) {
            arr[i] = Integer.parseInt(sc.next());
            double temp = t-arr[i]*0.006;
            arr[i] = Math.abs(a-temp);
        }
        int index = -1;
        double min = arr[0];
        for (int i = 0; i < n; i++) {
            if (min >= arr[i]){
                min = arr[i];
                index = i;
            }
        }
        System.out.println(index+1);
    }
}
/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