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- #include<bits/stdc++.h>
- using namespace std;
- int prime(int m)
- {
- int cnt=0,k;
- for(int i=3;i<=sqrt(m);i+=2)
- {
- if(m%i==0)
- {
- k=i;
- break;
- }
- }
- m=m-k;
- if(m!=0)
- {
- cnt++;
- prime(m);
- }
- else{
- cout<<cnt;
- }
- }
- int main()
- {
- int n;
- cin>>n;
- prime(n);
- }
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