1 #include<stdio.h>
 2 int main()
 3 {
 4     int n,i,s,j,a[100],w,k;
 5     while(scanf("%d",&n)==1)
 6     {
 7         printf("%d:",n);
 8         for (i=2; i<=n; i++)
 9         {
10             s=1;
11             for (j=2; j<=i/2; j++)
12             {
13                 if (i%j==0)
14                 {
15                     s+=j;
16                 }
17             }
18             if (s==i)
19             {
20                 printf(" %d",i);
21             }
22         }
23         printf("\n");
24     }
25 }