import sys

def main(args):
    
    X = int(input())
    
    fn = [i-1 for i in range(X+1)]#約数１の分を引く
    
    for i in range(2,X+1):
        fn[2*i::i] = map(lambda x:x-1,fn[2*i::i])
        
    #print(fn)
        
    minimum = float('inf')
    for a in range(1,X//2+1):
        tmp = abs(fn[a]-fn[X-a])
        if tmp < minimum:
            ans = {}
            ans[tmp] = [(a, X-a)]
            minimum = tmp
        elif tmp == minimum:
            ans[tmp].append((a, X-a))
    
    for r in ans[minimum]:
        u, v = r
        print(u, v)
    for r in ans[minimum][::-1]:
        u, v = r
        if u != v:
            print(v, u)
        
if __name__ == '__main__':
    main(sys.argv[1:])