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  1. #include <iostream>
  2. #include <string>
  3.  
  4. using namespace std;
  5.  
  6. int main() {
  7. int m, n;
  8. cin >> m >> n;
  9. cout << ((m - 1) * m * n / 2) + ((n - 1) * n * m / 2);
  10. return 0;
  11. }
Success #stdin #stdout 0s 5328KB
stdin
Standard input is empty
stdout
-608096320