import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int A[] = new int[N];

		for (int i = 0; i < N; i++) {
			A[i] = sc.nextInt();
		}
		sc.close();

		int max = 0;
		for (int i = 0; i < N; i++) {
			for (int j = 0; j < N; j++) {
				if (max < Math.abs(A[i] - A[j])) {
					max = Math.abs(A[i] - A[j]);
				}
			}
		}
		System.out.println(max);
	}
} import java.util.Scanner; Scanner 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];

		for (int i = 0; i < N; i++) {
			A[i] = sc.nextInt();
		}
		sc.close();

		int max = 0;
		for (int i = 0; i < N; i++) {
			for (int j = 0; j < N; j++) {
				if (max < Math.abs(A[i] - A[j])) {
					max = Math.abs(A[i] - A[j]);
				}
			}
		}
		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];

		for (int i = 0; i < N; i++) {
			A[i] = sc.nextInt();
		}
		sc.close();

		int max = 0;
		for (int i = 0; i < N; i++) {
			for (int j = 0; j < N; j++) {
				if (max < Math.abs(A[i] - A[j])) {
					max = Math.abs(A[i] - A[j]);
				}
			}
		}
		System.out.println(max);
	} main {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int A[] = new int[N];

		for (int i = 0; i < N; i++) {
			A[i] = sc.nextInt();
		}
		sc.close();

		int max = 0;
		for (int i = 0; i < N; i++) {
			for (int j = 0; j < N; j++) {
				if (max < Math.abs(A[i] - A[j])) {
					max = Math.abs(A[i] - A[j]);
				}
			}
		}
		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 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 sc.close() sc.close sc int max = 0; max 0 for (int i = 0; i < N; i++) {
			for (int j = 0; j < N; j++) {
				if (max < Math.abs(A[i] - A[j])) {
					max = Math.abs(A[i] - A[j]);
				}
			}
		} int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
			for (int j = 0; j < N; j++) {
				if (max < Math.abs(A[i] - A[j])) {
					max = Math.abs(A[i] - A[j]);
				}
			}
		} {
			for (int j = 0; j < N; j++) {
				if (max < Math.abs(A[i] - A[j])) {
					max = Math.abs(A[i] - A[j]);
				}
			}
		} for (int j = 0; j < N; j++) {
				if (max < Math.abs(A[i] - A[j])) {
					max = Math.abs(A[i] - A[j]);
				}
			} int j = 0; int j = 0; j 0 j < N j N j++ j++ j {
				if (max < Math.abs(A[i] - A[j])) {
					max = Math.abs(A[i] - A[j]);
				}
			} {
				if (max < Math.abs(A[i] - A[j])) {
					max = Math.abs(A[i] - A[j]);
				}
			} if (max < Math.abs(A[i] - A[j])) {
					max = Math.abs(A[i] - A[j]);
				} max < Math.abs(A[i] - A[j]) max Math.abs(A[i] - A[j]) Math.abs Math A[i] - A[j] A[i] A i A[j] A j {
					max = Math.abs(A[i] - A[j]);
				} max = Math.abs(A[i] - A[j]) max Math.abs(A[i] - A[j]) Math.abs Math A[i] - A[j] A[i] A i A[j] A j 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];

		for (int i = 0; i < N; i++) {
			A[i] = sc.nextInt();
		}
		sc.close();

		int max = 0;
		for (int i = 0; i < N; i++) {
			for (int j = 0; j < N; j++) {
				if (max < Math.abs(A[i] - A[j])) {
					max = Math.abs(A[i] - A[j]);
				}
			}
		}
		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];

		for (int i = 0; i < N; i++) {
			A[i] = sc.nextInt();
		}
		sc.close();

		int max = 0;
		for (int i = 0; i < N; i++) {
			for (int j = 0; j < N; j++) {
				if (max < Math.abs(A[i] - A[j])) {
					max = Math.abs(A[i] - A[j]);
				}
			}
		}
		System.out.println(max);
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int A[] = new int[N];

		for (int i = 0; i < N; i++) {
			A[i] = sc.nextInt();
		}
		sc.close();

		int max = 0;
		for (int i = 0; i < N; i++) {
			for (int j = 0; j < N; j++) {
				if (max < Math.abs(A[i] - A[j])) {
					max = Math.abs(A[i] - A[j]);
				}
			}
		}
		System.out.println(max);
	}
}
