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();
    }

    sc.close();

    double d0 = 999999;
    int p = 0;

    for (int i = 0; i < N; i++) {

      double d1 = T - H[i] * 0.006;
      double d2 = Math.abs(A - d1);

      if (d2 <= d0){
        d0 = d2;
        p = i;
      }

    }

    System.out.println(p+1);

  }

} import java.util.*; util.* java 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();
    }

    sc.close();

    double d0 = 999999;
    int p = 0;

    for (int i = 0; i < N; i++) {

      double d1 = T - H[i] * 0.006;
      double d2 = Math.abs(A - d1);

      if (d2 <= d0){
        d0 = d2;
        p = i;
      }

    }

    System.out.println(p+1);

  }

} 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();
    }

    sc.close();

    double d0 = 999999;
    int p = 0;

    for (int i = 0; i < N; i++) {

      double d1 = T - H[i] * 0.006;
      double d2 = Math.abs(A - d1);

      if (d2 <= d0){
        d0 = d2;
        p = i;
      }

    }

    System.out.println(p+1);

  } main {

    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();
    }

    sc.close();

    double d0 = 999999;
    int p = 0;

    for (int i = 0; i < N; i++) {

      double d1 = T - H[i] * 0.006;
      double d2 = Math.abs(A - d1);

      if (d2 <= d0){
        d0 = d2;
        p = i;
      }

    }

    System.out.println(p+1);

  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc int T = sc.nextInt(); T sc.nextInt() sc.nextInt sc int A = sc.nextInt(); A sc.nextInt() sc.nextInt sc int[] H = new int[N]; H new int[N] N for (int i = 0; i < N; i++) {
      H[i] = sc.nextInt();
    } int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
      H[i] = sc.nextInt();
    } {
      H[i] = sc.nextInt();
    } H[i] = sc.nextInt() H[i] H i sc.nextInt() sc.nextInt sc sc.close() sc.close sc double d0 = 999999; d0 999999 int p = 0; p 0 for (int i = 0; i < N; i++) {

      double d1 = T - H[i] * 0.006;
      double d2 = Math.abs(A - d1);

      if (d2 <= d0){
        d0 = d2;
        p = i;
      }

    } int i = 0; int i = 0; i 0 i < N i N i++ i++ i {

      double d1 = T - H[i] * 0.006;
      double d2 = Math.abs(A - d1);

      if (d2 <= d0){
        d0 = d2;
        p = i;
      }

    } {

      double d1 = T - H[i] * 0.006;
      double d2 = Math.abs(A - d1);

      if (d2 <= d0){
        d0 = d2;
        p = i;
      }

    } double d1 = T - H[i] * 0.006; d1 T - H[i] * 0.006 T H[i] * 0.006 H[i] H i 0.006 double d2 = Math.abs(A - d1); d2 Math.abs(A - d1) Math.abs Math A - d1 A d1 if (d2 <= d0){
        d0 = d2;
        p = i;
      } d2 <= d0 d2 d0 {
        d0 = d2;
        p = i;
      } d0 = d2 d0 d2 p = i p i System.out.println(p+1) System.out.println System.out System System.out p+1 p 1 String[] args args 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();
    }

    sc.close();

    double d0 = 999999;
    int p = 0;

    for (int i = 0; i < N; i++) {

      double d1 = T - H[i] * 0.006;
      double d2 = Math.abs(A - d1);

      if (d2 <= d0){
        d0 = d2;
        p = i;
      }

    }

    System.out.println(p+1);

  }

} 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();
    }

    sc.close();

    double d0 = 999999;
    int p = 0;

    for (int i = 0; i < N; i++) {

      double d1 = T - H[i] * 0.006;
      double d2 = Math.abs(A - d1);

      if (d2 <= d0){
        d0 = d2;
        p = i;
      }

    }

    System.out.println(p+1);

  }

} Main
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();
    }

    sc.close();

    double d0 = 999999;
    int p = 0;

    for (int i = 0; i < N; i++) {

      double d1 = T - H[i] * 0.006;
      double d2 = Math.abs(A - d1);

      if (d2 <= d0){
        d0 = d2;
        p = i;
      }

    }

    System.out.println(p+1);

  }

}