all done

day23/input.txt

@@ -0,0 +1,32 @@
+set b 540
+set c b
+jnz a 2
+jnz 1 5
+mul b 100
+sub b -100000
+set c b
+sub c -17000
+set f 1
+set d 2
+set e 2
+set g d
+mul g e
+sub g b
+jnz g 2
+set f 0
+sub e -1
+set g e
+sub g b
+jnz g -8
+sub d -1
+set g d
+sub g b
+jnz g -13
+jnz f 2
+sub h -1
+set g b
+sub g c
+jnz g 2
+jnz 1 3
+sub b -17
+jnz 1 -23

day23/part1.js

@@ -0,0 +1,30 @@
+var pc = 0;
+var registers = {a: 0, b: 0, c: 0, d: 0, e: 0, f: 0, g: 0, h: 0};
+var instructions = require("fs").readFileSync("input.txt").toString().split("\n").filter((a)=>(a));
+var numMul = 0;
+while((pc >= 0) && (pc < instructions.length)){
+	val = a => ((isNaN(parseInt(a))) ? (registers[a]) : (parseInt(a)));
+	var instruction = instructions[pc];
+	var parts = instruction.split(" ");
+	var pcstart = pc;
+	switch(parts[0]){
+		case "set":
+			registers[parts[1]] = val(parts[2]);
+			break;
+		case "sub":
+			registers[parts[1]] -= val(parts[2]);
+			break;
+		case "mul":
+			numMul++;
+			registers[parts[1]] *= val(parts[2]);
+			break;
+		case "jnz":
+			if(val(parts[1]) != 0){
+				pc += (val(parts[2]) - 1);
+			}
+			break;
+	}
+	pc++;
+}
+console.log(numMul);
+console.log(registers);

day23/part2.js

@@ -0,0 +1,13 @@
+var num = 106700;
+var end = 123700;
+var numNotPrime = 0;
+while(num <= end){
+	for(var i = 2; i <= Math.sqrt(num); i++){
+		if(num%i == 0){
+			i = num;
+			numNotPrime++;
+		}
+	}
+	num += 17;
+}
+console.log(numNotPrime);