import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		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[] sa = new double[n];

		for (int i = 0; i < n; i++) {
			sa[i] = Math.abs(t - h[i] * 0.006 - a);
		}

		int kotae = 0;
		double hikaku = 2000000000;

		for (int j = 0; j < n; j++) {
			if (hikaku > sa[j]) {
				hikaku = sa[j];
				kotae = j;
			}

		}
		System.out.println(kotae + 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