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();
		}

		int max = a[0];
		int min = a[0];

		for (int i = 0; i < a.length; i++) {
			int tmp = a[i];
			if(tmp > max) {
				max = tmp;
				continue;
			}
			if(tmp < min) {
				min = tmp;
				continue;
			}
		}
		System.out.println(max - min);
	}

} 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();
		}

		int max = a[0];
		int min = a[0];

		for (int i = 0; i < a.length; i++) {
			int tmp = a[i];
			if(tmp > max) {
				max = tmp;
				continue;
			}
			if(tmp < min) {
				min = tmp;
				continue;
			}
		}
		System.out.println(max - min);
	}

} 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();
		}

		int max = a[0];
		int min = a[0];

		for (int i = 0; i < a.length; i++) {
			int tmp = a[i];
			if(tmp > max) {
				max = tmp;
				continue;
			}
			if(tmp < min) {
				min = tmp;
				continue;
			}
		}
		System.out.println(max - min);
	} 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();
		}

		int max = a[0];
		int min = a[0];

		for (int i = 0; i < a.length; i++) {
			int tmp = a[i];
			if(tmp > max) {
				max = tmp;
				continue;
			}
			if(tmp < min) {
				min = tmp;
				continue;
			}
		}
		System.out.println(max - min);
	} 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 int max = a[0]; max a[0] a 0 int min = a[0]; min a[0] a 0 for (int i = 0; i < a.length; i++) {
			int tmp = a[i];
			if(tmp > max) {
				max = tmp;
				continue;
			}
			if(tmp < min) {
				min = tmp;
				continue;
			}
		} int i = 0; int i = 0; i 0 i < a.length i a.length a a.length i++ i++ i {
			int tmp = a[i];
			if(tmp > max) {
				max = tmp;
				continue;
			}
			if(tmp < min) {
				min = tmp;
				continue;
			}
		} {
			int tmp = a[i];
			if(tmp > max) {
				max = tmp;
				continue;
			}
			if(tmp < min) {
				min = tmp;
				continue;
			}
		} int tmp = a[i]; tmp a[i] a i if(tmp > max) {
				max = tmp;
				continue;
			} tmp > max tmp max {
				max = tmp;
				continue;
			} max = tmp max tmp continue; if(tmp < min) {
				min = tmp;
				continue;
			} tmp < min tmp min {
				min = tmp;
				continue;
			} min = tmp min tmp continue; System.out.println(max - min) System.out.println System.out System System.out max - min max min 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();
		}

		int max = a[0];
		int min = a[0];

		for (int i = 0; i < a.length; i++) {
			int tmp = a[i];
			if(tmp > max) {
				max = tmp;
				continue;
			}
			if(tmp < min) {
				min = tmp;
				continue;
			}
		}
		System.out.println(max - min);
	}

} 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();
		}

		int max = a[0];
		int min = a[0];

		for (int i = 0; i < a.length; i++) {
			int tmp = a[i];
			if(tmp > max) {
				max = tmp;
				continue;
			}
			if(tmp < min) {
				min = tmp;
				continue;
			}
		}
		System.out.println(max - min);
	}

} 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();
		}

		int max = a[0];
		int min = a[0];

		for (int i = 0; i < a.length; i++) {
			int tmp = a[i];
			if(tmp > max) {
				max = tmp;
				continue;
			}
			if(tmp < min) {
				min = tmp;
				continue;
			}
		}
		System.out.println(max - min);
	}

}
