def main():
    import sys
    input = sys.stdin.readline

    X = int(input())

    num_d = list(range(X+1))
    for d in range(1, X+1):
        for j in range(1, (X // d) + 1):
            num_d[d*j] -= 1

    diff = 10**8
    ans = []
    for a in range(1, (X//2)+1):
        tmp = abs(num_d[a] - num_d[X-a])
        if tmp < diff:
            ans = [a]
            diff = tmp
        elif tmp == diff:
            ans.append(a)
    for a in ans:
        print(a, X-a)
    if ans[-1]*2 == X:
        ans.pop()
    for a in reversed(ans):
        print(X-a, a)



if __name__ == '__main__':
    main()