import java.util.*;

public class Main {
	public static void main(String[] args) {
		int i,j;
		Scanner sc = new Scanner(System.in);
		int n = Integer.parseInt(sc.next());
		int t = Integer.parseInt(sc.next());
		int a = Integer.parseInt(sc.next());
		int[] h = new int[n];
		for(i = 0; i < n; i++) {
			h[i] = Integer.parseInt(sc.next());
		}
		sc.close();
		double tp = 1000.0;
		double tt;
		int ti = 0;
		for(i = 0; i < n; i++) {
			tt = Math.abs(a - (t - h[i] * 0.006));
			if(tp > tt) {
				tp = tt;
				ti = i;
			}
		}
		System.out.println(ti+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