#include <iostream>
#include <functional>
 
struct Data {
  size_t d_size;
  double *d_data;
  Data(size_t size) : d_size(size), d_data(new double[size]) {}
  ~Data() { delete[] d_data; }
  double &operator[](size_t i) { return d_data[i]; }
};
 
 
 
int main() {
  size_t len = 50000000;
  Data im(len);
  for (size_t index = 0; index != len; ++index)
    im[index] = static_cast<double>(index);
 
  double sum = 0;
  for (size_t index = 0; index != len; ++index)
    sum += im[index];
 
  std::cout << sum << '\n';
}

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