function getMaxProfit(arr) {
	var minPrice = arr[0];
	var maxProfit = 0;
	for(var i = 0; i < arr.length; i ++) {
		var currentPrice = arr[i];
		minPrice= Math.min(minPrice, currentPrice);
		var potentialProfit = currentPrice - minPrice;
		
		maxprofit = Math.max(maxProfit,potentialProfit);
	}
	return maxProfit
}