import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int[] A = new int[N];
    int max =0;
    for (int i=0; i<N; i++) {
      A[i] = sc.nextInt();
    }
    for (int i=0; i<N; i++) {
      for (int j=i+1; j<N; j++) {
        max = Math.max(Math.abs(A[i]-A[j]),max);
      }
    }                                  
    System.out.println(max);
  }
} 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[] A = new int[N];
    int max =0;
    for (int i=0; i<N; i++) {
      A[i] = sc.nextInt();
    }
    for (int i=0; i<N; i++) {
      for (int j=i+1; j<N; j++) {
        max = Math.max(Math.abs(A[i]-A[j]),max);
      }
    }                                  
    System.out.println(max);
  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int[] A = new int[N];
    int max =0;
    for (int i=0; i<N; i++) {
      A[i] = sc.nextInt();
    }
    for (int i=0; i<N; i++) {
      for (int j=i+1; j<N; j++) {
        max = Math.max(Math.abs(A[i]-A[j]),max);
      }
    }                                  
    System.out.println(max);
  } main {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int[] A = new int[N];
    int max =0;
    for (int i=0; i<N; i++) {
      A[i] = sc.nextInt();
    }
    for (int i=0; i<N; i++) {
      for (int j=i+1; j<N; j++) {
        max = Math.max(Math.abs(A[i]-A[j]),max);
      }
    }                                  
    System.out.println(max);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc int[] A = new int[N]; A new int[N] N int max =0; max 0 for (int i=0; i<N; i++) {
      A[i] = sc.nextInt();
    } int i=0; int i=0; i 0 i<N i N i++ i++ i {
      A[i] = sc.nextInt();
    } {
      A[i] = sc.nextInt();
    } A[i] = sc.nextInt() A[i] A i sc.nextInt() sc.nextInt sc for (int i=0; i<N; i++) {
      for (int j=i+1; j<N; j++) {
        max = Math.max(Math.abs(A[i]-A[j]),max);
      }
    } int i=0; int i=0; i 0 i<N i N i++ i++ i {
      for (int j=i+1; j<N; j++) {
        max = Math.max(Math.abs(A[i]-A[j]),max);
      }
    } {
      for (int j=i+1; j<N; j++) {
        max = Math.max(Math.abs(A[i]-A[j]),max);
      }
    } for (int j=i+1; j<N; j++) {
        max = Math.max(Math.abs(A[i]-A[j]),max);
      } int j=i+1; int j=i+1; j i+1 i 1 j<N j N j++ j++ j {
        max = Math.max(Math.abs(A[i]-A[j]),max);
      } {
        max = Math.max(Math.abs(A[i]-A[j]),max);
      } max = Math.max(Math.abs(A[i]-A[j]),max) max Math.max(Math.abs(A[i]-A[j]),max) Math.max Math Math.abs(A[i]-A[j]) Math.abs Math A[i]-A[j] A[i] A i A[j] A j max System.out.println(max) System.out.println System.out System System.out max String[] args args public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int[] A = new int[N];
    int max =0;
    for (int i=0; i<N; i++) {
      A[i] = sc.nextInt();
    }
    for (int i=0; i<N; i++) {
      for (int j=i+1; j<N; j++) {
        max = Math.max(Math.abs(A[i]-A[j]),max);
      }
    }                                  
    System.out.println(max);
  }
} public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int[] A = new int[N];
    int max =0;
    for (int i=0; i<N; i++) {
      A[i] = sc.nextInt();
    }
    for (int i=0; i<N; i++) {
      for (int j=i+1; j<N; j++) {
        max = Math.max(Math.abs(A[i]-A[j]),max);
      }
    }                                  
    System.out.println(max);
  }
} Main
import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int[] A = new int[N];
    int max =0;
    for (int i=0; i<N; i++) {
      A[i] = sc.nextInt();
    }
    for (int i=0; i<N; i++) {
      for (int j=i+1; j<N; j++) {
        max = Math.max(Math.abs(A[i]-A[j]),max);
      }
    }                                  
    System.out.println(max);
  }
}