using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Text;
using System.Globalization;
using System.Diagnostics;



class Myon
{
    public Myon() { }
    public static int Main()
    {
        new Myon().calc();
        return 0;
    }
    

    Scanner cin;

    void calc()
    {
        cin = new Scanner();
        int N = cin.nextInt();
        int Ma = cin.nextInt();
        int Mb = cin.nextInt();
        int[] a = new int[N];
        int[] b = new int[N];
        int[] c = new int[N];
        int[] d = new int[N];
        for (int i = 0; i < N; i++)
        {
            a[i] = cin.nextInt();
            b[i] = cin.nextInt();
            c[i] = cin.nextInt();
            d[i] = a[i] * Mb - b[i] * Ma;
        }

        int DMAX = 10000;
        int MAX = int.MaxValue / 2;
        int[] dp = new int[DMAX];
        for (int i = 0; i < DMAX; i++)
        {
            dp[i] = MAX;
        }

        for (int i = 0; i < N; i++)
        {
            if (d[i] < 0)
            {
                for (int j = 0; j < DMAX; j++)
                {
                    int start = dp[j];
                    if (j == DMAX / 2) start = 0;
                    if (start == MAX) continue;

                    int next = j + d[i];
                    int ncost = start + c[i];

                    dp[next] = Math.Min(dp[next], ncost);
                }
            }
            else
            {
                for (int j = DMAX - 1; j >= 0; j--)
                {
                    int start = dp[j];
                    if (j == DMAX / 2) start = 0;
                    if (start == MAX) continue;

                    int next = j + d[i];
                    int ncost = start + c[i];

                    dp[next] = Math.Min(dp[next], ncost);
                }
            }
        }

        if (dp[DMAX / 2] == MAX) Console.WriteLine(-1);
        else Console.WriteLine(dp[DMAX / 2]);
    }
    


}


class Scanner
{
    string[] s;
    int i;

    char[] cs = new char[] { ' ' };

    public Scanner()
    {
        s = new string[0];
        i = 0;
    }

    public string next()
    {
        if (i < s.Length) return s[i++];
        string st = Console.ReadLine();
        while (st == "") st = Console.ReadLine();
        s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
        if (s.Length == 0) return next();
        i = 0;
        return s[i++];
    }

    public int nextInt()
    {
        return int.Parse(next());
    }
    public int[] ArrayInt(int N, int add = 0)
    {
        int[] Array = new int[N];
        for (int i = 0; i < N; i++)
        {
            Array[i] = nextInt() + add;
        }
        return Array;
    }

    public long nextLong()
    {
        return long.Parse(next());
    }

    public long[] ArrayLong(int N, long add = 0)
    {
        long[] Array = new long[N];
        for (int i = 0; i < N; i++)
        {
            Array[i] = nextLong() + add;
        }
        return Array;
    }

    public double nextDouble()
    {
        return double.Parse(next());
    }


    public double[] ArrayDouble(int N, double add = 0)
    {
        double[] Array = new double[N];
        for (int i = 0; i < N; i++)
        {
            Array[i] = nextDouble() + add;
        }
        return Array;
    }
}


Measured memory_bytes: 13220