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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int main() {
  6. double a, t;
  7. cin >> a >> t;
  8.  
  9. double luas;
  10.  
  11. luas = 0.5 * a * t ;
  12.  
  13. cout << fixed << setprecision(2);
  14. cout << luas << endl;
  15. }
  16.  
Success #stdin #stdout 0s 5268KB
stdin
5 6
stdout
15.00