> #include<iostream.h>
> int p(long n)
> {if(n==3) return 1;
> if(n%3==0) return 0;
> int h=4;
> for(int i=5;i*i<=n;i+=h)
> {if(n%i==0) return 0;
> h=6-h;}
> return 1;
> }
> int main()
> {long s,k=0;
> while(1)
> {cin>>s; cout<<endl;if(s==0) break;
>  if(p(s-3)==1)
> 	 cout<<s<<'='<<3<<'+'<<s-3<<endl;
>  else
>  {int h=4;  
>  for(long i=5;i<=s/2;i+=h)
>  {if(p(i)==1&&p(s-i)==1)
> 	{ cout<<s<<'='<<i<<'+'<<s-i<<endl; 
>  k=1;break;}h=6-h;}
> 	if(k==0)
> 		{cout<<"Goldbach's conjecture is wrong."<<endl;return 0;}
> 	}
> }
>   return 0;
> }
>