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- #include <iostream>
- using namespace std;
- int main()
- {
- long long int c,p,k;
- cin>>c>>p;
- if(c<p*(p+1)/2)
- cout<<c;
- else
- k=(c-p*(p+1)/2)/p,cout<<c-p*(p+1)/2-k*p;
- return 0;
- }
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