import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		double t = sc.nextDouble();
		double a = sc.nextDouble();
		int[] arr = new int[n];
		double min = Double.MAX_VALUE;
		int res = -1;
		for (int i = 0; i<n; i++) {
			double tmp = Math.abs(a - (t - 0.006 * sc.nextInt()));
			if (tmp < min) {
				res = i+1;
				min = tmp;
			}
		}
		System.out.println(res);

	}
}

/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