How can I run this C program?

gistfile1.txt

// firstHeadsUpC.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

#include <stdio.h>

int main ()
{
  int decks;
	puts("Enter a number of decks");
	scanf("%i", &decks);
	if (decks < 1) {
		puts("That is not a vaid number of decks");
		return 1;
	}
	printf("There are %i cards \n", (decks *52));
	return 0;
}