Problem: This is an interactive problem. You have to use a flush operation right after printing each line. For example, in C++ you should use the function fflush(stdout), in Java — System.out.flush(), in Pascal — flush(output) and in Python — sys.stdout.flush().

Mr. Chanek wants to buy a flamingo to accompany his chickens on his farm. Before going to the pet shop, Mr. Chanek stops at an animal festival to have fun. It turns out there is a carnival game with a flamingo as the prize.

There are N mysterious cages, which are numbered from 1 to N. Cage i has A_i (0 ≤ A_i ≤ 10^3) flamingoes inside (1 ≤ i ≤ N). However, the game master keeps the number of flamingoes inside a secret. To win the flamingo, Mr. Chanek must guess the number of flamingoes in each cage.

Coincidentally, Mr. Chanek has N coins. Each coin can be used to ask once, what is the total number of flamingoes inside cages numbered L to R inclusive? With L < R.

Input

Use standard input to read the responses of your questions.

Initially, the judge will give an integer N (3 ≤ N ≤ 10^3), the number of cages, and the number of coins Mr. Chanek has.

For each of your questions, the jury will give an integer that denotes the number of flamingoes from cage L to R inclusive.

If your program does not guess the flamingoes or ask other questions, you will get "Wrong Answer". Of course, if your program asks more questions than the allowed number, your program will get "Wrong Answer".

Output

To ask questions, your program must use standard output.

Then, you can ask at most N questions. Questions are asked in the format "? L R", (1 ≤ L < R ≤ N). 

To guess the flamingoes, print a line that starts with "!" followed by N integers where the i-th integer denotes the number of flamingo in cage i. After answering, your program must terminate or will receive the "idle limit exceeded" verdict. You can only guess the flamingoes once.

Examples

Input

6
 
5
 
15
 
10
 

Output

 
? 1 2
 
? 5 6
 
? 3 4
 
! 1 4 4 6 7 8

Note

In the sample input, the correct flamingoes amount is [1, 4, 4, 6, 7, 8].

Solution (in JAVA):

Solution:


import java.util.*;
import java.io.*;

public class flamingoes_of_mystery {
	static StringBuilder sb;
	static dsu dsu;
	static long fact[];
	static long mod = (int) (1e9);

	static void solve() {
		int n = i();
		int[]ans = new int[n+1];
		
		System.out.println("? "+1+" "+2);
		System.out.flush();
		int onetwo = i();
		
		
		System.out.println("? "+2+" "+3);
		System.out.flush();
		int twothree = i();
		
		System.out.println("? "+1+" "+3);
		System.out.flush();
		int onethree = i();
		
		ans[3] = onethree-onetwo;
		ans[2] = twothree - ans[3];
		ans[1] = onetwo - ans[2];
		
		for(int i =4;i<=n;i++){
		System.out.println("? "+(i-1)+" "+i);
		System.out.flush();
		int temp = i();
		ans[i] = temp - ans[i-1];
		}
		sb.append("!");
		for(int i=1;i<=n;i++){
		    sb.append(" "+ans[i]);
		}
		sb.append("\n");
	}

	public static void main(String[] args) {
		sb = new StringBuilder();
		int test = 1;
//		test = i();
		while (test-- > 0) {
			solve();
		}
		System.out.println(sb);

	}

	/*
	 * fact=new long[(int)1e6+10]; fact[0]=fact[1]=1; for(int i=2;i<fact.length;i++)
	 * { fact[i]=((long)(i%mod)1L(long)(fact[i-1]%mod))%mod; }
	 */
//**************NCR%P******************	 
	static long ncr(int n, int r) {
		if (r > n)
			return (long) 0;

		long res = fact[n] % mod;
		// System.out.println(res);
		res = ((long) (res % mod) * (long) (p(fact[r], mod - 2) % mod)) % mod;
		res = ((long) (res % mod) * (long) (p(fact[n - r], mod - 2) % mod)) % mod;
		// System.out.println(res);
		return res;

	}

	static long p(long x, long y)// POWER FXN //
	{
		if (y == 0)
			return 1;

		long res = 1;
		while (y > 0) {
			if (y % 2 == 1) {
				res = (res * x) % mod;
				y--;
			}

			x = (x * x) % mod;
			y = y / 2;

		}
		return res;
	}

//**************END******************

	// *************Disjoint set
	// union*********//
	static class dsu {
		int parent[];

		dsu(int n) {
			parent = new int[n];
			for (int i = 0; i < n; i++)
				parent[i] = -1;
		}

		int find(int a) {
			if (parent[a] < 0)
				return a;
			else {
				int x = find(parent[a]);
				parent[a] = x;
				return x;
			}
		}

		void merge(int a, int b) {
			a = find(a);
			b = find(b);
			if (a == b)
				return;
			parent[b] = a;
		}
	}

//**************PRIME FACTORIZE **********************************//
	static TreeMap<Integer, Integer> prime(long n) {
		TreeMap<Integer, Integer> h = new TreeMap<>();
		long num = n;
		for (int i = 2; i <= Math.sqrt(num); i++) {
			if (n % i == 0) {
				int nt = 0;
				while (n % i == 0) {
					n = n / i;
					nt++;
				}
				h.put(i, nt);
			}
		}
		if (n != 1)
			h.put((int) n, 1);
		return h;

	}

//****CLASS PAIR ************************************************
	static class Pair implements Comparable<Pair> {
		int x;
		int y;

		Pair(int x, int y) {
			this.x = x;
			this.y = y;
		}

		public int compareTo(Pair o) {
			return (int) (this.y - o.y);

		}

	}
//****CLASS PAIR **************************************************

	static class InputReader {
		private InputStream stream;
		private byte[] buf = new byte[1024];
		private int curChar;
		private int numChars;
		private SpaceCharFilter filter;

		public InputReader(InputStream stream) {
			this.stream = stream;
		}

		public int read() {
			if (numChars == -1)
				throw new InputMismatchException();
			if (curChar >= numChars) {
				curChar = 0;
				try {
					numChars = stream.read(buf);
				} catch (IOException e) {
					throw new InputMismatchException();
				}
				if (numChars <= 0)
					return -1;
			}
			return buf[curChar++];
		}

		public int Int() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			int sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			int res = 0;
			do {
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res *= 10;
				res += c - '0';
				c = read();
			} while (!isSpaceChar(c));
			return res * sgn;
		}

		public String String() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isSpaceChar(c));
			return res.toString();
		}

		public boolean isSpaceChar(int c) {
			if (filter != null)
				return filter.isSpaceChar(c);
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}

		public String next() {
			return String();
		}

		public interface SpaceCharFilter {
			public boolean isSpaceChar(int ch);
		}
	}

	static class OutputWriter {
		private final PrintWriter writer;

		public OutputWriter(OutputStream outputStream) {
			writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
		}

		public OutputWriter(Writer writer) {
			this.writer = new PrintWriter(writer);
		}

		public void print(Object... objects) {
			for (int i = 0; i < objects.length; i++) {
				if (i != 0)
					writer.print(' ');
				writer.print(objects[i]);
			}
		}

		public void printLine(Object... objects) {
			print(objects);
			writer.println();
		}

		public void close() {
			writer.close();
		}

		public void flush() {
			writer.flush();
		}
	}

	static InputReader in = new InputReader(System.in);
	static OutputWriter out = new OutputWriter(System.out);

	public static long[] sort(long[] a2) {
		int n = a2.length;
		ArrayList<Long> l = new ArrayList<>();
		for (long i : a2)
			l.add(i);
		Collections.sort(l);
		for (int i = 0; i < l.size(); i++)
			a2[i] = l.get(i);
		return a2;
	}

	public static int[] sort(int[] a2) {
		int n = a2.length;
		ArrayList<Integer> l = new ArrayList<>();
		for (int i : a2)
			l.add(i);
		Collections.sort(l);
		for (int i = 0; i < l.size(); i++)
			a2[i] = l.get(i);
		return a2;
	}

	public static long pow(long x, long y) {
		long res = 1;
		while (y > 0) {
			if (y % 2 != 0) {
				res = (res * x);// % modulus;
				y--;

			}
			x = (x * x);// % modulus;
			y = y / 2;
		}
		return res;
	}

//GCD___+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
	public static long gcd(long x, long y) {
		if (x == 0)
			return y;
		else
			return gcd(y % x, x);
	}
	// ******LOWEST COMMON MULTIPLE
	// *********************************************

	public static long lcm(long x, long y) {
		return (x * (y / gcd(x, y)));
	}

//INPUT PATTERN********************************************************
	public static int i() {
		return in.Int();
	}

	public static long l() {
		String s = in.String();
		return Long.parseLong(s);
	}

	public static String s() {
		return in.String();
	}

	public static int[] readArrayi(int n) {
		int A[] = new int[n];
		for (int i = 0; i < n; i++) {
			A[i] = i();
		}
		return A;
	}

	public static long[] readArray(long n) {
		long A[] = new long[(int) n];
		for (int i = 0; i < n; i++) {
			A[i] = l();
		}
		return A;
	}

}