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];
		double[] t = new double[n];

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