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- #include<bits/stdc++.h>
- using namespace std;
- int gcd(int n)
- {
- int i,j,g=0;
- for(i=1;i<n;i++)
- {
- for(j=i+1;j<=n;j++)
- g+=__gcd(i,j);
- }
- return g;
- }
- int main()
- {
- int n;
- while(cin>>n && n)
- {
- int a=gcd(n);
- cout<<a<<endl;
- }
- return 0;
- }
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