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();
		double min= 100000;
		int num = 0;
		for (int i=0;i<N;i++) {
			int temp = sc.nextInt();
			double re = Math.abs(A-(T-temp *0.006));
			if (re<min) {
				min = re;
				num =i+1;
			}
		}
		System.out.println(num);
	}
}
/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