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- #include <iostream>
- using namespace std;
- int main()
- {
- int per, a, rez;
- cin>>per>>a;
- if(a==0 || per==0)
- {
- cout<<"0"<<endl;
- return 0;
- }
- rez=((per*a)-(2*(a*a)))/2;
- cout<<rez<<endl;
- return 0;
- }
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