#include <stdio.h>

int add(int a, int b)
{
  int result;
  result = a+b;
  return result;
}

int sub(int a, int b)
{
  int result;
  result = add(a,-b);
  return result;
}

int algorithm()
{
  printf("result: %d\n", sub(2,1));
}

int main(int argc, char *argv[])
{
  algorithm();
  return 0;
}