import java.util.*;
public 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();
    int[] H = new int[N];
    double mindelta = Double.MAX_VALUE;
    int ans=0;
    for(int i=0; i<N;i++){
      H[i]=sc.nextInt();
      double temp = T- H[i]*0.006;
      double delta = Math.abs(A-temp);
      if (mindelta>delta){
        mindelta=delta;
        ans=i;
      }
    }
    System.out.println(ans+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