#include <stdio.h>

int main(int argc, char** argv) {
  const unsigned int N = 10000000;

  unsigned long sum = 0;
  for (unsigned int i = 1; i <= N; ++i) {
    sum += i;
  }

  printf("The sum from 1 to %d is %lu.\n", N, sum);

  return 0;
}