#include <iostream>
int main()
{
  int sum = 0, value = 0;
  //讀取數據直到遇到end-of-file，計算所有讀入的值的和
  while (std::cin >> value)
    sum += value; //等價於sum = sum + value
  std::cout << "Sum is: " << sum << std::endl;
  return 0;
}