import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.Closeable;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;

public class Main implements Runnable {
    static ContestScanner in;
    static Writer out;
    public static void main(String[] args) {
        new Thread(null, new Main(), "", 16 * 1024 * 1024).start();
    }

    public void run() {
        Main main = new Main();
        try {
            in = new ContestScanner();
            out = new Writer();
            main.solve();
            out.close();
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    void solve() throws IOException {
        int n = in.nextInt();
        int ma = in.nextInt();
        int mb = in.nextInt();
        int dpsize = n * 10 + 1;
        int[][] dp = new int[dpsize][dpsize];
        int inf = Integer.MAX_VALUE / 2;
        for (int i = 0; i < dpsize; i++) {
            Arrays.fill(dp[i], inf);
        }
        dp[0][0] = 0;
        for(int i = 0; i < n; i++) {
            int a = in.nextInt();
            int b = in.nextInt();
            int c = in.nextInt();
            for (int j = dpsize - 1; j >= 0; j--) {
                for (int k = dpsize - 1; k >= 0; k--) {
                    if(dp[j][k] == inf) continue;
                    dp[j + a][k + b] = Math.min(dp[j + a][k + b],
                            dp[j][k] + c);
                }
            }
        }
        int ans = inf;
        for (int i = 1; i < dpsize; i++) {
            if(i % ma != 0) continue;
            for (int j = 1; j < dpsize; j++) {
                if(j % mb != 0 || j / mb != i / ma) continue;
                ans = Math.min(ans, dp[i][j]);
            }
        }
        if(ans == inf) ans = -1;
        System.out.println(ans);
    }
}

@SuppressWarnings("serial")
class MultiSet<T> extends HashMap<T, Integer>{
    @Override public Integer get(Object key){return containsKey(key)?super.get(key):0;}
    public void add(T key,int v){put(key,get(key)+v);}
    public void add(T key){put(key,get(key)+1);}
    public void sub(T key){final int v=get(key);if(v==1)remove(key);else put(key,v-1);}
    public MultiSet<T> merge(MultiSet<T> set)
    {MultiSet<T>s,l;if(this.size()<set.size()){s=this;l=set;}else{s=set;l=this;}
        for(Entry<T,Integer>e:s.entrySet())l.add(e.getKey(),e.getValue());return l;}
}

class Writer extends PrintWriter{
    public Writer(String filename)throws IOException
    {super(new BufferedWriter(new FileWriter(filename)));}
    public Writer()throws IOException{super(System.out);}
}
class ContestScanner implements Closeable{
    private BufferedReader in;private int c=-2;
    public ContestScanner()throws IOException
    {in=new BufferedReader(new InputStreamReader(System.in));}
    public ContestScanner(String filename)throws IOException
    {in=new BufferedReader(new InputStreamReader(new FileInputStream(filename)));}
    public String nextToken()throws IOException {
        StringBuilder sb=new StringBuilder();
        while((c=in.read())!=-1&&Character.isWhitespace(c));
        while(c!=-1&&!Character.isWhitespace(c)){sb.append((char)c);c=in.read();}
        return sb.toString();
    }
    public String readLine()throws IOException{
        StringBuilder sb=new StringBuilder();if(c==-2)c=in.read();
        while(c!=-1&&c!='\n'&&c!='\r'){sb.append((char)c);c=in.read();}
        return sb.toString();
    }
    public long nextLong()throws IOException,NumberFormatException
    {return Long.parseLong(nextToken());}
    public int nextInt()throws NumberFormatException,IOException
    {return(int)nextLong();}
    public double nextDouble()throws NumberFormatException,IOException
    {return Double.parseDouble(nextToken());}
    public void close() throws IOException {in.close();}
}

Measured memory_bytes: 23124