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_index = 0;
    int df = Integer.MAX_VALUE;
    for (int i = 0; i < N; i++) {
      int temp = T * 1000 - (H[i] * 6);
      int df_tmp = Math.abs(temp - 1000 * A);
      if (df > df_tmp) {
        df = df_tmp;
        ans_index = i + 1;
      }
    }
    System.out.println(ans_index);
  }
} 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();
    }
    int ans_index = 0;
    int df = Integer.MAX_VALUE;
    for (int i = 0; i < N; i++) {
      int temp = T * 1000 - (H[i] * 6);
      int df_tmp = Math.abs(temp - 1000 * A);
      if (df > df_tmp) {
        df = df_tmp;
        ans_index = i + 1;
      }
    }
    System.out.println(ans_index);
  }
} 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_index = 0;
    int df = Integer.MAX_VALUE;
    for (int i = 0; i < N; i++) {
      int temp = T * 1000 - (H[i] * 6);
      int df_tmp = Math.abs(temp - 1000 * A);
      if (df > df_tmp) {
        df = df_tmp;
        ans_index = i + 1;
      }
    }
    System.out.println(ans_index);
  } 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();
    }
    int ans_index = 0;
    int df = Integer.MAX_VALUE;
    for (int i = 0; i < N; i++) {
      int temp = T * 1000 - (H[i] * 6);
      int df_tmp = Math.abs(temp - 1000 * A);
      if (df > df_tmp) {
        df = df_tmp;
        ans_index = i + 1;
      }
    }
    System.out.println(ans_index);
  } 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 int ans_index = 0; ans_index 0 int df = Integer.MAX_VALUE; df Integer.MAX_VALUE Integer Integer.MAX_VALUE for (int i = 0; i < N; i++) {
      int temp = T * 1000 - (H[i] * 6);
      int df_tmp = Math.abs(temp - 1000 * A);
      if (df > df_tmp) {
        df = df_tmp;
        ans_index = i + 1;
      }
    } int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
      int temp = T * 1000 - (H[i] * 6);
      int df_tmp = Math.abs(temp - 1000 * A);
      if (df > df_tmp) {
        df = df_tmp;
        ans_index = i + 1;
      }
    } {
      int temp = T * 1000 - (H[i] * 6);
      int df_tmp = Math.abs(temp - 1000 * A);
      if (df > df_tmp) {
        df = df_tmp;
        ans_index = i + 1;
      }
    } int temp = T * 1000 - (H[i] * 6); temp T * 1000 - (H[i] * 6) T * 1000 T 1000 (H[i] * 6) H[i] H i 6 int df_tmp = Math.abs(temp - 1000 * A); df_tmp Math.abs(temp - 1000 * A) Math.abs Math temp - 1000 * A temp 1000 * A 1000 A if (df > df_tmp) {
        df = df_tmp;
        ans_index = i + 1;
      } df > df_tmp df df_tmp {
        df = df_tmp;
        ans_index = i + 1;
      } df = df_tmp df df_tmp ans_index = i + 1 ans_index i + 1 i 1 System.out.println(ans_index) System.out.println System.out System System.out ans_index 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();
    }
    int ans_index = 0;
    int df = Integer.MAX_VALUE;
    for (int i = 0; i < N; i++) {
      int temp = T * 1000 - (H[i] * 6);
      int df_tmp = Math.abs(temp - 1000 * A);
      if (df > df_tmp) {
        df = df_tmp;
        ans_index = i + 1;
      }
    }
    System.out.println(ans_index);
  }
} 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_index = 0;
    int df = Integer.MAX_VALUE;
    for (int i = 0; i < N; i++) {
      int temp = T * 1000 - (H[i] * 6);
      int df_tmp = Math.abs(temp - 1000 * A);
      if (df > df_tmp) {
        df = df_tmp;
        ans_index = i + 1;
      }
    }
    System.out.println(ans_index);
  }
} 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();
    }
    int ans_index = 0;
    int df = Integer.MAX_VALUE;
    for (int i = 0; i < N; i++) {
      int temp = T * 1000 - (H[i] * 6);
      int df_tmp = Math.abs(temp - 1000 * A);
      if (df > df_tmp) {
        df = df_tmp;
        ans_index = i + 1;
      }
    }
    System.out.println(ans_index);
  }
}