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];
    for(int i=0; i<N; i++){
      H[i] = sc.nextInt();
    }
    int ans = 0;
    double min = Integer.MAX_VALUE;
    for (int i = 0; i < N; i++) {
      double d = Math.abs(A - (T - H[i] * 0.006));
      if (min > d) {
        min = d;
        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