import java.util.Scanner;

public class Main {

	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[] H = new int[N];
		int T = sc.nextInt();
		int A = sc.nextInt();
		int difference = Integer.MAX_VALUE;
		int index = 0;
		for (int i = 0; i < H.length; i++) {
			int input = sc.nextInt();
			int ave = T * 1000 - input * 6;
			H[i] = Math.abs(A * 1000 - ave);
			if (difference > H[i]) {
				difference = H[i];
				index = i + 1;
			}
		}
		System.out.println(index);
		sc.close();
	}
}
/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