\documentclass{article}
\begin{document}
\begin{verbatim}
#include <stdio.h>

int main (void)
{
  int T1, T2, T3, T4;
  int notebooks;

  scanf("%i %i %i %i", &T1, &T2, &T3, &T4);

  notebooks = T1 + T2 + T4 + T4 - 3;

  printf("%i\n", notebooks);

  return 0;
}

\end{verbatim}
\end{document}