import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int X[] = new int[N];
		for(int i = 0; i < N; i++) {
			X[i] = sc.nextInt();
		}
		int result = 1000000;
		for(int i = 1; i < 101; i++) {
			int sum = 0;
			for(int j = 0; j < N; j++) {
				sum += (X[j] - i) * (X[j] - i);
			}
			result = Math.min(result, sum);
		}
		System.out.println(result);
	}
} 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 X[] = new int[N];
		for(int i = 0; i < N; i++) {
			X[i] = sc.nextInt();
		}
		int result = 1000000;
		for(int i = 1; i < 101; i++) {
			int sum = 0;
			for(int j = 0; j < N; j++) {
				sum += (X[j] - i) * (X[j] - i);
			}
			result = Math.min(result, sum);
		}
		System.out.println(result);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int X[] = new int[N];
		for(int i = 0; i < N; i++) {
			X[i] = sc.nextInt();
		}
		int result = 1000000;
		for(int i = 1; i < 101; i++) {
			int sum = 0;
			for(int j = 0; j < N; j++) {
				sum += (X[j] - i) * (X[j] - i);
			}
			result = Math.min(result, sum);
		}
		System.out.println(result);
	} main {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int X[] = new int[N];
		for(int i = 0; i < N; i++) {
			X[i] = sc.nextInt();
		}
		int result = 1000000;
		for(int i = 1; i < 101; i++) {
			int sum = 0;
			for(int j = 0; j < N; j++) {
				sum += (X[j] - i) * (X[j] - i);
			}
			result = Math.min(result, sum);
		}
		System.out.println(result);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc int X[] = new int[N]; X new int[N] N for(int i = 0; i < N; i++) {
			X[i] = sc.nextInt();
		} int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
			X[i] = sc.nextInt();
		} {
			X[i] = sc.nextInt();
		} X[i] = sc.nextInt() X[i] X i sc.nextInt() sc.nextInt sc int result = 1000000; result 1000000 for(int i = 1; i < 101; i++) {
			int sum = 0;
			for(int j = 0; j < N; j++) {
				sum += (X[j] - i) * (X[j] - i);
			}
			result = Math.min(result, sum);
		} int i = 1; int i = 1; i 1 i < 101 i 101 i++ i++ i {
			int sum = 0;
			for(int j = 0; j < N; j++) {
				sum += (X[j] - i) * (X[j] - i);
			}
			result = Math.min(result, sum);
		} {
			int sum = 0;
			for(int j = 0; j < N; j++) {
				sum += (X[j] - i) * (X[j] - i);
			}
			result = Math.min(result, sum);
		} int sum = 0; sum 0 for(int j = 0; j < N; j++) {
				sum += (X[j] - i) * (X[j] - i);
			} int j = 0; int j = 0; j 0 j < N j N j++ j++ j {
				sum += (X[j] - i) * (X[j] - i);
			} {
				sum += (X[j] - i) * (X[j] - i);
			} sum += (X[j] - i) * (X[j] - i) sum (X[j] - i) * (X[j] - i) (X[j] - i) X[j] X j i (X[j] - i) X[j] X j i result = Math.min(result, sum) result Math.min(result, sum) Math.min Math result sum System.out.println(result) System.out.println System.out System System.out result String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int X[] = new int[N];
		for(int i = 0; i < N; i++) {
			X[i] = sc.nextInt();
		}
		int result = 1000000;
		for(int i = 1; i < 101; i++) {
			int sum = 0;
			for(int j = 0; j < N; j++) {
				sum += (X[j] - i) * (X[j] - i);
			}
			result = Math.min(result, sum);
		}
		System.out.println(result);
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int X[] = new int[N];
		for(int i = 0; i < N; i++) {
			X[i] = sc.nextInt();
		}
		int result = 1000000;
		for(int i = 1; i < 101; i++) {
			int sum = 0;
			for(int j = 0; j < N; j++) {
				sum += (X[j] - i) * (X[j] - i);
			}
			result = Math.min(result, sum);
		}
		System.out.println(result);
	}
} 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 X[] = new int[N];
		for(int i = 0; i < N; i++) {
			X[i] = sc.nextInt();
		}
		int result = 1000000;
		for(int i = 1; i < 101; i++) {
			int sum = 0;
			for(int j = 0; j < N; j++) {
				sum += (X[j] - i) * (X[j] - i);
			}
			result = Math.min(result, sum);
		}
		System.out.println(result);
	}
}