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- #include <bits/stdc++.h>
- using namespace std;
- int main()
- {
- int n=1000000, i, j;
- bool a[n+1];
- for(i=0; i<=n; i++) a[i]=1;
- for(i=2; i*i<=n; i++) {
- if(a[i]==1) {
- for(j=i*i; j<n; j+=i) a[j]=0;
- }
- }
- int num;
- while(1) {
- cin>>num;
- if(num==0) break;
- for(i=2; i<num; i++) {
- int k=num-i;
- if(a[i]==1 && a[k]==1) {
- printf("%d:\n%d+%d\n", num, i, k);
- break;
- }
- }
- if(i==num) printf("%d:\nNO WAY!\n", num);
- }
- }
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