import java.util.Scanner;

public class Main {
	public static void main(String args[]){
		Scanner scan = new Scanner(System.in);
		int n =scan.nextInt();
		int t =scan.nextInt();
		int a =scan.nextInt();
		int h[] = new int[n];
		for (int i = 0; i < n; i++) {
			h[i] = scan.nextInt();
		}

		double temp = Math.abs(a - (t - h[0] * 0.006));
		int ans = 0;
		for ( int i = 1; i < n; i++) {
			if (Math.abs(a - (t - h[i] * 0.006)) < temp) {
				temp = Math.abs(a - (t - h[i] * 0.006));
				ans = i;
			}
		}

		System.out.println(ans + 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