#include<stdio.h> int main() { int n,count=0;//count用来判断是否被整除 scanf("%d", &n); if(n%2==0) { printf("2 "); count=1; } if(n%3==0) { printf("3 "); count=1; } if(n%7==0) { printf("7 "); count=1; } if(count==0) printf("n"); return 0; }