var input = 10000;

var elves = [];
for(var i = 0; i < input; i++){
	elves[i] = true;
}

var i = 0;
var count = elves.length;
while(count > 1){
	if(!(count%1000)) console.log(count)
	var toRemoveAhead = Math.floor(count/2);
	var pos = i;
	var passed = 0;
	while(passed < toRemoveAhead){
		pos = (pos + 1)%(elves.length);
		if(elves[pos]){
			passed++;
		}
	}
	elves[pos] = false;
	count--;

	i = (i+1)%(elves.length);
	while(elves[i] == false){
		i = (i+1)%(elves.length);
	}
}

console.log(elves.indexOf(true) + 1);