import java.util.*;
import java.io.*;
import java.math.*;
 
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        double t = sc.nextDouble();
        double a = sc.nextDouble();
        double rem = Integer.MAX_VALUE;
        int ans = 0;
        for(int i = 1; i <= n; i++){
            double h = sc.nextDouble();
            if(rem > Math.abs(t-h*0.006-a)){
                ans = i;
                rem = Math.abs(t-h*0.006-a);
            }
        }
        System.out.println(ans);
    }
}
/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