#include<bits/stdc++.h>
def main():
    n = int(input())
    a=[3,5,7]
    t=1
    s=''
    for i in a:
        if(n%i==0):
            t=0
            s+=str(i)+' '
    if(t):
        print('n')
    else:
        print(s)
    return 0
main()

奇怪的代码，帮我看看