function Main(input) {
	// the first line is assigned to input[0], the second line is assigned to input[1] similarly.
	input = input.split("\n");
	input.forEach(function(N) {
		if(N == "") return;
		var ans = Math.ceil(Math.log(parseInt(N)) / Math.log(2));
		console.log("%d", ans);
	});
}
// Don't edit this line!
Main(require("fs").readFileSync("/dev/stdin", "utf8"));