import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;
public class Main {
	public static void main(String[] args) {
		FastScanner sc = new FastScanner(System.in);
		PrintWriter pw = new PrintWriter(System.out);
		int N = sc.nextInt();
		int[][] list = new int[N][100];
		for(int i = 0;i < N; i++) {
			int a = sc.nextInt();
			for(int j = 1; j <= 100; j++) {
				list[i][j-1] = (j-a)*(j-a);
			}
		}
		int ans = listCheck(list);
		pw.print(ans);
		pw.close();
	}
	
	static int listCheck(int[][] list) {
		int ans = Integer.MAX_VALUE;
		for(int i = 0; i < 100; i++) {
			int check = 0;
			for(int j = 0; j< list.length; j++) {
				check += list[j][i];
			}
			if(ans > check)ans = check;
		}
		return ans;
	}
	
	static class FastScanner {
		private BufferedReader reader = null;
	    private StringTokenizer tokenizer = null;

	    public FastScanner(InputStream in) {
	        reader = new BufferedReader(new InputStreamReader(in));
	        tokenizer = null;
	    }

	    public String next() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                tokenizer = new StringTokenizer(reader.readLine());
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }
	        return tokenizer.nextToken();
	    }

	    public String nextLine() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                return reader.readLine();
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }

	        return tokenizer.nextToken("\n");
	    }

	    public long nextLong() {
	        return Long.parseLong(next());
	    }

	    public int nextInt() {
	        return Integer.parseInt(next());
	    }

	    public double nextDouble() {
	         return Double.parseDouble(next());
	     }

	    public int[] nextIntArray(int n) {
	        int[] a = new int[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextInt();
	        return a;
	    }

	    public long[] nextLongArray(int n) {
	        long[] a = new long[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextLong();
	        return a;
	    }
	}
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.InputStreamReader; InputStreamReader java.io import java.io.PrintWriter; PrintWriter java.io import java.util.StringTokenizer; StringTokenizer java.util public class Main {
	public static void main(String[] args) {
		FastScanner sc = new FastScanner(System.in);
		PrintWriter pw = new PrintWriter(System.out);
		int N = sc.nextInt();
		int[][] list = new int[N][100];
		for(int i = 0;i < N; i++) {
			int a = sc.nextInt();
			for(int j = 1; j <= 100; j++) {
				list[i][j-1] = (j-a)*(j-a);
			}
		}
		int ans = listCheck(list);
		pw.print(ans);
		pw.close();
	}
	
	static int listCheck(int[][] list) {
		int ans = Integer.MAX_VALUE;
		for(int i = 0; i < 100; i++) {
			int check = 0;
			for(int j = 0; j< list.length; j++) {
				check += list[j][i];
			}
			if(ans > check)ans = check;
		}
		return ans;
	}
	
	static class FastScanner {
		private BufferedReader reader = null;
	    private StringTokenizer tokenizer = null;

	    public FastScanner(InputStream in) {
	        reader = new BufferedReader(new InputStreamReader(in));
	        tokenizer = null;
	    }

	    public String next() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                tokenizer = new StringTokenizer(reader.readLine());
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }
	        return tokenizer.nextToken();
	    }

	    public String nextLine() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                return reader.readLine();
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }

	        return tokenizer.nextToken("\n");
	    }

	    public long nextLong() {
	        return Long.parseLong(next());
	    }

	    public int nextInt() {
	        return Integer.parseInt(next());
	    }

	    public double nextDouble() {
	         return Double.parseDouble(next());
	     }

	    public int[] nextIntArray(int n) {
	        int[] a = new int[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextInt();
	        return a;
	    }

	    public long[] nextLongArray(int n) {
	        long[] a = new long[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextLong();
	        return a;
	    }
	}
} Main public static void main(String[] args) {
		FastScanner sc = new FastScanner(System.in);
		PrintWriter pw = new PrintWriter(System.out);
		int N = sc.nextInt();
		int[][] list = new int[N][100];
		for(int i = 0;i < N; i++) {
			int a = sc.nextInt();
			for(int j = 1; j <= 100; j++) {
				list[i][j-1] = (j-a)*(j-a);
			}
		}
		int ans = listCheck(list);
		pw.print(ans);
		pw.close();
	} main {
		FastScanner sc = new FastScanner(System.in);
		PrintWriter pw = new PrintWriter(System.out);
		int N = sc.nextInt();
		int[][] list = new int[N][100];
		for(int i = 0;i < N; i++) {
			int a = sc.nextInt();
			for(int j = 1; j <= 100; j++) {
				list[i][j-1] = (j-a)*(j-a);
			}
		}
		int ans = listCheck(list);
		pw.print(ans);
		pw.close();
	} FastScanner sc = new FastScanner(System.in); sc new FastScanner(System.in) PrintWriter pw = new PrintWriter(System.out); pw new PrintWriter(System.out) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc int[][] list = new int[N][100]; list new int[N][100] N 100 for(int i = 0;i < N; i++) {
			int a = sc.nextInt();
			for(int j = 1; j <= 100; j++) {
				list[i][j-1] = (j-a)*(j-a);
			}
		} int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
			int a = sc.nextInt();
			for(int j = 1; j <= 100; j++) {
				list[i][j-1] = (j-a)*(j-a);
			}
		} {
			int a = sc.nextInt();
			for(int j = 1; j <= 100; j++) {
				list[i][j-1] = (j-a)*(j-a);
			}
		} int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc for(int j = 1; j <= 100; j++) {
				list[i][j-1] = (j-a)*(j-a);
			} int j = 1; int j = 1; j 1 j <= 100 j 100 j++ j++ j {
				list[i][j-1] = (j-a)*(j-a);
			} {
				list[i][j-1] = (j-a)*(j-a);
			} list[i][j-1] = (j-a)*(j-a) list[i][j-1] list[i] list i j-1 j 1 (j-a)*(j-a) (j-a) j a (j-a) j a int ans = listCheck(list); ans listCheck(list) listCheck list pw.print(ans) pw.print pw ans pw.close() pw.close pw String[] args args static int listCheck(int[][] list) {
		int ans = Integer.MAX_VALUE;
		for(int i = 0; i < 100; i++) {
			int check = 0;
			for(int j = 0; j< list.length; j++) {
				check += list[j][i];
			}
			if(ans > check)ans = check;
		}
		return ans;
	} listCheck {
		int ans = Integer.MAX_VALUE;
		for(int i = 0; i < 100; i++) {
			int check = 0;
			for(int j = 0; j< list.length; j++) {
				check += list[j][i];
			}
			if(ans > check)ans = check;
		}
		return ans;
	} int ans = Integer.MAX_VALUE; ans Integer.MAX_VALUE Integer Integer.MAX_VALUE for(int i = 0; i < 100; i++) {
			int check = 0;
			for(int j = 0; j< list.length; j++) {
				check += list[j][i];
			}
			if(ans > check)ans = check;
		} int i = 0; int i = 0; i 0 i < 100 i 100 i++ i++ i {
			int check = 0;
			for(int j = 0; j< list.length; j++) {
				check += list[j][i];
			}
			if(ans > check)ans = check;
		} {
			int check = 0;
			for(int j = 0; j< list.length; j++) {
				check += list[j][i];
			}
			if(ans > check)ans = check;
		} int check = 0; check 0 for(int j = 0; j< list.length; j++) {
				check += list[j][i];
			} int j = 0; int j = 0; j 0 j< list.length j list.length list list.length j++ j++ j {
				check += list[j][i];
			} {
				check += list[j][i];
			} check += list[j][i] check list[j][i] list[j] list j i if(ans > check)ans = check; ans > check ans check ans = check ans check return ans; ans int[][] list list static class FastScanner {
		private BufferedReader reader = null;
	    private StringTokenizer tokenizer = null;

	    public FastScanner(InputStream in) {
	        reader = new BufferedReader(new InputStreamReader(in));
	        tokenizer = null;
	    }

	    public String next() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                tokenizer = new StringTokenizer(reader.readLine());
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }
	        return tokenizer.nextToken();
	    }

	    public String nextLine() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                return reader.readLine();
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }

	        return tokenizer.nextToken("\n");
	    }

	    public long nextLong() {
	        return Long.parseLong(next());
	    }

	    public int nextInt() {
	        return Integer.parseInt(next());
	    }

	    public double nextDouble() {
	         return Double.parseDouble(next());
	     }

	    public int[] nextIntArray(int n) {
	        int[] a = new int[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextInt();
	        return a;
	    }

	    public long[] nextLongArray(int n) {
	        long[] a = new long[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextLong();
	        return a;
	    }
	} FastScanner private BufferedReader reader = null; reader null private StringTokenizer tokenizer = null; tokenizer null public FastScanner(InputStream in) {
	        reader = new BufferedReader(new InputStreamReader(in));
	        tokenizer = null;
	    } FastScanner {
	        reader = new BufferedReader(new InputStreamReader(in));
	        tokenizer = null;
	    } reader = new BufferedReader(new InputStreamReader(in)) reader new BufferedReader(new InputStreamReader(in)) tokenizer = null tokenizer null InputStream in in public String next() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                tokenizer = new StringTokenizer(reader.readLine());
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }
	        return tokenizer.nextToken();
	    } next {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                tokenizer = new StringTokenizer(reader.readLine());
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }
	        return tokenizer.nextToken();
	    } if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                tokenizer = new StringTokenizer(reader.readLine());
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        } tokenizer == null || !tokenizer.hasMoreTokens() tokenizer == null tokenizer null !tokenizer.hasMoreTokens() tokenizer.hasMoreTokens() tokenizer.hasMoreTokens tokenizer {
	            try {
	                tokenizer = new StringTokenizer(reader.readLine());
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        } try {
	                tokenizer = new StringTokenizer(reader.readLine());
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            } IOException e {
	                throw new RuntimeException(e);
	            } throw new RuntimeException(e); new RuntimeException(e) {
	                tokenizer = new StringTokenizer(reader.readLine());
	            } tokenizer = new StringTokenizer(reader.readLine()) tokenizer new StringTokenizer(reader.readLine()) return tokenizer.nextToken(); tokenizer.nextToken() tokenizer.nextToken tokenizer public String nextLine() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                return reader.readLine();
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }

	        return tokenizer.nextToken("\n");
	    } nextLine {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                return reader.readLine();
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }

	        return tokenizer.nextToken("\n");
	    } if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                return reader.readLine();
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        } tokenizer == null || !tokenizer.hasMoreTokens() tokenizer == null tokenizer null !tokenizer.hasMoreTokens() tokenizer.hasMoreTokens() tokenizer.hasMoreTokens tokenizer {
	            try {
	                return reader.readLine();
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        } try {
	                return reader.readLine();
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            } IOException e {
	                throw new RuntimeException(e);
	            } throw new RuntimeException(e); new RuntimeException(e) {
	                return reader.readLine();
	            } return reader.readLine(); reader.readLine() reader.readLine reader return tokenizer.nextToken("\n"); tokenizer.nextToken("\n") tokenizer.nextToken tokenizer "\n" public long nextLong() {
	        return Long.parseLong(next());
	    } nextLong {
	        return Long.parseLong(next());
	    } return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next public int nextInt() {
	        return Integer.parseInt(next());
	    } nextInt {
	        return Integer.parseInt(next());
	    } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next public double nextDouble() {
	         return Double.parseDouble(next());
	     } nextDouble {
	         return Double.parseDouble(next());
	     } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next public int[] nextIntArray(int n) {
	        int[] a = new int[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextInt();
	        return a;
	    } nextIntArray {
	        int[] a = new int[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextInt();
	        return a;
	    } int[] a = new int[n]; a new int[n] n for (int i = 0; i < n; i++)
	            a[i] = nextInt(); int i = 0; int i = 0; i 0 i < n i n i++ i++ i a[i] = nextInt(); a[i] = nextInt() a[i] a i nextInt() nextInt return a; a int n n public long[] nextLongArray(int n) {
	        long[] a = new long[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextLong();
	        return a;
	    } nextLongArray {
	        long[] a = new long[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextLong();
	        return a;
	    } long[] a = new long[n]; a new long[n] n for (int i = 0; i < n; i++)
	            a[i] = nextLong(); int i = 0; int i = 0; i 0 i < n i n i++ i++ i a[i] = nextLong(); a[i] = nextLong() a[i] a i nextLong() nextLong return a; a int n n public class Main {
	public static void main(String[] args) {
		FastScanner sc = new FastScanner(System.in);
		PrintWriter pw = new PrintWriter(System.out);
		int N = sc.nextInt();
		int[][] list = new int[N][100];
		for(int i = 0;i < N; i++) {
			int a = sc.nextInt();
			for(int j = 1; j <= 100; j++) {
				list[i][j-1] = (j-a)*(j-a);
			}
		}
		int ans = listCheck(list);
		pw.print(ans);
		pw.close();
	}
	
	static int listCheck(int[][] list) {
		int ans = Integer.MAX_VALUE;
		for(int i = 0; i < 100; i++) {
			int check = 0;
			for(int j = 0; j< list.length; j++) {
				check += list[j][i];
			}
			if(ans > check)ans = check;
		}
		return ans;
	}
	
	static class FastScanner {
		private BufferedReader reader = null;
	    private StringTokenizer tokenizer = null;

	    public FastScanner(InputStream in) {
	        reader = new BufferedReader(new InputStreamReader(in));
	        tokenizer = null;
	    }

	    public String next() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                tokenizer = new StringTokenizer(reader.readLine());
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }
	        return tokenizer.nextToken();
	    }

	    public String nextLine() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                return reader.readLine();
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }

	        return tokenizer.nextToken("\n");
	    }

	    public long nextLong() {
	        return Long.parseLong(next());
	    }

	    public int nextInt() {
	        return Integer.parseInt(next());
	    }

	    public double nextDouble() {
	         return Double.parseDouble(next());
	     }

	    public int[] nextIntArray(int n) {
	        int[] a = new int[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextInt();
	        return a;
	    }

	    public long[] nextLongArray(int n) {
	        long[] a = new long[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextLong();
	        return a;
	    }
	}
} public class Main {
	public static void main(String[] args) {
		FastScanner sc = new FastScanner(System.in);
		PrintWriter pw = new PrintWriter(System.out);
		int N = sc.nextInt();
		int[][] list = new int[N][100];
		for(int i = 0;i < N; i++) {
			int a = sc.nextInt();
			for(int j = 1; j <= 100; j++) {
				list[i][j-1] = (j-a)*(j-a);
			}
		}
		int ans = listCheck(list);
		pw.print(ans);
		pw.close();
	}
	
	static int listCheck(int[][] list) {
		int ans = Integer.MAX_VALUE;
		for(int i = 0; i < 100; i++) {
			int check = 0;
			for(int j = 0; j< list.length; j++) {
				check += list[j][i];
			}
			if(ans > check)ans = check;
		}
		return ans;
	}
	
	static class FastScanner {
		private BufferedReader reader = null;
	    private StringTokenizer tokenizer = null;

	    public FastScanner(InputStream in) {
	        reader = new BufferedReader(new InputStreamReader(in));
	        tokenizer = null;
	    }

	    public String next() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                tokenizer = new StringTokenizer(reader.readLine());
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }
	        return tokenizer.nextToken();
	    }

	    public String nextLine() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                return reader.readLine();
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }

	        return tokenizer.nextToken("\n");
	    }

	    public long nextLong() {
	        return Long.parseLong(next());
	    }

	    public int nextInt() {
	        return Integer.parseInt(next());
	    }

	    public double nextDouble() {
	         return Double.parseDouble(next());
	     }

	    public int[] nextIntArray(int n) {
	        int[] a = new int[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextInt();
	        return a;
	    }

	    public long[] nextLongArray(int n) {
	        long[] a = new long[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextLong();
	        return a;
	    }
	}
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;
public class Main {
	public static void main(String[] args) {
		FastScanner sc = new FastScanner(System.in);
		PrintWriter pw = new PrintWriter(System.out);
		int N = sc.nextInt();
		int[][] list = new int[N][100];
		for(int i = 0;i < N; i++) {
			int a = sc.nextInt();
			for(int j = 1; j <= 100; j++) {
				list[i][j-1] = (j-a)*(j-a);
			}
		}
		int ans = listCheck(list);
		pw.print(ans);
		pw.close();
	}
	
	static int listCheck(int[][] list) {
		int ans = Integer.MAX_VALUE;
		for(int i = 0; i < 100; i++) {
			int check = 0;
			for(int j = 0; j< list.length; j++) {
				check += list[j][i];
			}
			if(ans > check)ans = check;
		}
		return ans;
	}
	
	static class FastScanner {
		private BufferedReader reader = null;
	    private StringTokenizer tokenizer = null;

	    public FastScanner(InputStream in) {
	        reader = new BufferedReader(new InputStreamReader(in));
	        tokenizer = null;
	    }

	    public String next() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                tokenizer = new StringTokenizer(reader.readLine());
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }
	        return tokenizer.nextToken();
	    }

	    public String nextLine() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                return reader.readLine();
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }

	        return tokenizer.nextToken("\n");
	    }

	    public long nextLong() {
	        return Long.parseLong(next());
	    }

	    public int nextInt() {
	        return Integer.parseInt(next());
	    }

	    public double nextDouble() {
	         return Double.parseDouble(next());
	     }

	    public int[] nextIntArray(int n) {
	        int[] a = new int[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextInt();
	        return a;
	    }

	    public long[] nextLongArray(int n) {
	        long[] a = new long[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextLong();
	        return a;
	    }
	}
}