import java.util.Scanner;
class Main{
    public static void main(String[] args) {
        Scanner scn=new Scanner(System.in);
        int n=scn.nextInt();
        int t=scn.nextInt();
        int a=scn.nextInt();
        int[] place=new int[n];
        for(int i=0;i<n;i++){
            place[i]=scn.nextInt();
        }
        double dif=Math.abs(t-0.006*place[0]-a);
        int answer =0;
        for(int i=1;i<n;i++){
            if(Math.abs(t-0.006*place[i]-a)<dif){
                dif =Math.abs(t-0.006*place[i]-a);
                answer = i;
            }
        }
        System.out.println(answer+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