Advertisement
Not a member of Pastebin yet?
Sign Up,
it unlocks many cool features!
- #include<bits/stdc++.h>
- using namespace std;
- long long int phi(long long int n)
- {
- long long int res;
- res=n;
- for(int i=2;i*i<=n;i++)
- {
- if(n%i==0)
- {
- while(n%i==0)
- {
- n/=i;
- }
- res=res-(res/i);
- }
- }
- if(n>1)
- res=res-(res/n);
- return res;
- }
- int main()
- {
- long long int n,ans;
- while(cin>>n && n)
- {
- ans=phi(n);
- cout<<ans<<endl;
- }
- return 0;
- }
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement