var maps = {};
for(var map of require("fs").readFileSync("input.txt").toString().split("\n").filter(a=>(a))){
	map = map.split(" => ");
	maps[map[0]] = map[1];
}

for(var i = 0; i < 1; i++){
	for(var input of Object.keys(maps)){
		var lines = input.split("/");
		rotated = input.split("/").map((line,y)=>(line.split("").map((a, x)=>(lines[lines.length-1-x][y])).join(""))).join("/");
		maps[rotated] = maps[input];
	}
}

for(var input of Object.keys(maps)){
	maps[input.split("/").reverse().join("/")] = maps[input];
}

for(var input of Object.keys(maps)){
	maps[input.split("/").map(line=>(line.split("").reverse().join(""))).join("/")] = maps[input];
}

function runRound(textInput){
	var oldGrid = textInput.split("/").map((a)=>(a.split("")));
	var sideLen = oldGrid[0].length;
	if(sideLen%2 == 0){
		var sideSquares = sideLen/2;
		var squareLen = 2;
		var newSquareLen = 3;
	}
	else if(sideLen%3 == 0){
		var sideSquares = sideLen/3;
		var squareLen = 3;
		var newSquareLen = 4;
	}

	var newGrid = [];
	for(var i = 0; i < (sideSquares * newSquareLen); i++){
		newGrid[i] = [];
	}

	for(var x = 0; x < sideSquares; x++){
		for(var y = 0; y < sideSquares; y++){
			var section = [];
			for(var i = 0; i < squareLen; i++){
				section.push(oldGrid[(y*squareLen) + i].slice(x*squareLen, (x+1)*squareLen));
			}
			var sectionText = section.map((a)=>(a.join(""))).join("/");
			var newSectionText = maps[sectionText];
			var newSection = newSectionText.split("/").map(a=>(a.split("")));
			for(var x1 = 0; x1 < newSquareLen; x1++){
				for(var y1= 0; y1 < newSquareLen; y1++){
					newGrid[(y*newSquareLen) + y1][(x*newSquareLen) + x1] = newSection[y1][x1];
				}
			}
		}
	}
	return newGrid.map(a=>(a.join(""))).join("/")
}

var currentGrid = ".#./..#/###";
var iters = 18;
for(var i = 0; i < iters; i++){
	currentGrid = runRound(currentGrid);
}
console.log(currentGrid.split("").filter(a=>(a=="#")).length);