import java.util.*;

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());
    
    double min = 10000.0;
    int ans = 0;
    for(int i = 1; i <= N; i++){
      int x = Integer.parseInt(sc.next());
      double d = T - x*0.006;
      double e = Math.abs(A-d);
      if(e < min){
        min = e;
        ans = i;
      }
    }
    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