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();
		int h = 0;

		int result = 0;
		double min = Double.MAX_VALUE;
		for (int i=1; i<=n; i++) {
			h = sc.nextInt();
			if (Math.abs(t-h*0.006-a) < min) {
				min = Math.abs(t-h*0.006-a);
				result = i;	
			}
		}
		System.out.print(result);
    }
}
/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