import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt(), t = sc.nextInt(), a = sc.nextInt(), x=0;
        double ans = 100000;
        for(int i=0;i<n;i++){
            int h = sc.nextInt();
            if(Math.abs(a - (t - h * 0.006)) < ans){
                ans = Math.abs(a - (t - h * 0.006));
                x = i;
            }
        }
        System.out.println(x + 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