var lines = require("fs").readFileSync("input.txt").toString().split("\n").filter((a)=>(a));
var top = lines[0].split(" ")[0];
var oldtop = "";
while(oldtop != top){
	oldtop = top;
	for(var line of lines){
		if(line.indexOf("->") != -1){
			if(line.split(" -> ")[1].split(", ").indexOf(top) != -1){
				top = line.split(" ")[0];
			}
		}
	}
}
//console.log(top);

var discs = {};
for(var line of lines){
	var disc = {
		weight: parseInt(new RegExp("\(([0-9]+)\)").exec(line)[0]),
		subweight: 0,
		children: []
	}
	if(line.indexOf("->") != -1){
		disc.children = line.split(" -> ")[1].split(", ");
	}
	discs[line.split(" ")[0]] = disc;
}

function calcsubweight(id){
	if(discs[id].children.length == 0){
		return discs[id].weight;
	}
	else{
		var childweight = -1;
		discs[id].subweight += discs[id].weight;
		for(var child of discs[id].children){
			discs[child].subweight = calcsubweight(child);
			discs[id].subweight += discs[child].subweight;
			if(childweight != discs[child].subweight && childweight != -1){
				console.log(id, child, childweight, discs[child].subweight);
			}
			childweight = discs[child].subweight;
		}
		return discs[id].subweight;
	}
}

function debugPrint(id, i){
console.log(i, id, discs[id]);
	for(var child of discs[id].children){
		debugPrint(child, i+1);
	}
}

calcsubweight(top);
debugPrint("wknuyhc", 0);
//console.log(discs);