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function fibonacci (upto) {
	if(upto.length == 0) {
		console.log("Usage: fibonacci <upto>.");
	} else {
		var first = 0, second = 1, sum;
		var fibonacci_string = "";
		fibonacci_string += (first + " " + second);
		for (var counter = 0; counter < (upto - 2); counter++) {
			sum = first + second;
			fibonacci_string += (" " + sum);
			first = second;
			second = sum;
		};
		console.log(fibonacci_string);
	}
}

fibonacci(process.argv.splice(2));