import java.util.*;

class Main{
  public static void main(String[] args){
    Scanner sc=new Scanner(System.in);
    int n=sc.nextInt();
    int t=sc.nextInt();
    int a=sc.nextInt();
    double A=(t-a)*1000/6.0;
    double[] h=new double[n];
    for(int i=0;i<n;i++){
      h[i]=Math.abs(sc.nextInt()-A);
    }
    int idx=0;
    for(int i=1;i<n;i++){
      if(h[i]<h[idx]){
        idx=i;
      }
    }
    System.out.println(idx+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