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- #include<iostream>
- using namespace std;
- int main()
- {
- long long n, s=0, i, k, j, h;
- cin>>n>>k;
- if(n>k)
- {
- for(i=1; i<k; i++)
- {
- s=s+i;
- }
- for(j=k; j<=n; j++)
- {
- s=s+j%k;
- }
- }
- else
- {
- for(h=1; h<=n; h++)
- {
- s=s+h;
- }
- }
- cout<<s;
- return 0;
- }
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