10079 - Pizza Cutting/10079.cpp

   1 #include <cstdlib>
   2 #include <iostream>
   3
   4 using namespace std;
   5
   6 int main(int argc, char *argv[])
   7 {
   8     long long n, max;
   9     cin >> n;
  10     while (n >= 0){
  11           if (n % 2 == 0){
  12              max = n / 2;
  13              max *= (n + 1);
  14              max++;
  15           }else{
  16              max = (n + 1) / 2;
  17              max *= n;
  18              max++;
  19           }
  20           cout << max << endl;
  21           cin >> n;
  22     }
  23     return 0;
  24 }