import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        
        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(int i = 0; i < n; i++){
            h[i] = Integer.parseInt(sc.next());
        }
        
        double min = 10000;
        int ans = 0;
        for(int i = 0; i < n; i++){
            double j = t - h[i]*0.006;
            if(Math.abs(a-j) < min){
                min = Math.abs(a-j);
                ans = i+1;
            }
        }
        
        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