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- #include<bits/stdc++.h>
- using namespace std;
- long long int faru(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;
- }
- int main()
- {
- long long int a,i,j,n;
- while(cin>>n)
- {
- if(n==0)
- break;
- if(n==1)
- cout<<0<<endl;
- else
- {
- a=faru(n);
- cout<<a<<endl;
- }
- }
- return 0;
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