import sys

def ask(l, r):
    print('?', l, r, flush=True)
    return int(input())

def solve(N):
    answers = [0] * N
    total_sum = ask(1, N)
    for i in range(1, N):
        two_sum = ask(i, i + 1)
        answers[i - 1] = total_sum - two_sum
        total_sum = two_sum
    answers[-1] = total_sum
    return answers

def main():
    N = int(input())
    answers = solve(N)
    print('!', *answers)

if __name__ == "__main__":
    main()