1 #include 
     
       2 #define _for(i,a,b) for(int i = (a);i < (b);i ++) 3 using namespace std; 4  5 bool ok(int y,int k) 6 { 7     return (y*k%(y-k)==0); 8 } 9 10 int forx(int y,int k)11 {12     return y*k/(y-k);13 }14 15 int main()16 {17     int k;18     while(~scanf("%d",&k))19     {20         int n = 0;21         vector
      
       
        > v; 22         23         _for(i,k+1,2*k+1)24         {25             if(ok(i,k))26             {27                 28                 n ++;29                 v.push_back({forx(i,k),i});30             }31             32         }33         34         printf("%d\n",n);35         _for(i,0,v.size())36             printf("1/%d = 1/%d + 1/%d\n",k,v[i].first,v[i].second);37     }38     return 0;39 }