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- #include<bits/stdc++.h>
- using namespace std;
- long long int phi(long long int n)
- {
- long long int i,ans=n;
- for(i=2;i*i<=n;i++)
- {
- if(n%i==0)
- {
- while(n%i==0)
- n/=i;
- ans-=(ans/i);
- }
- }
- if(n>1)
- ans-=(ans/n);
- return ans;
- }
- long long int div(long long int n)
- {
- long long int i,j,ans=0;
- for(i=1;i*i<=n;i++)
- {
- if(n%i==0)
- {
- ans++;
- if(n/i!=i)
- ans++;
- }
- }
- return ans;
- }
- int main()
- {
- long long int n,i,j,gd,a,b,ans;
- while(cin>>n)
- {
- // ans=0;
- a=phi(n);
- b=div(n);
- ans=n-(a+b);
- cout<<ans+1<<endl;
- }
- return 0;
- }
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