#include <iostream>
#include <map>
#include <set>
#include <cmath>
#include <algorithm>
#include <vector>
#include <string>
#include <fstream>
#include <bitset>
#include <queue>
#include <stack>
#include <deque>
#include <complex>
#include <iomanip>
#include <stdio.h>
#include <string.h>
#include <functional>

using std::cin;
using std::cout;
using std::cerr;
using std::endl;

using std::map;
using std::set;
using std::bitset;
using std::vector;
using std::string;
using std::multimap;
using std::multiset;
using std::deque;
using std::queue;
using std::stack;
using std::pair;
using std::iterator;

using std::sort;
using std::stable_sort;
using std::reverse;
using std::max_element;
using std::min_element;
using std::unique;
using std::ios_base;
using std::swap;
using std::fill;

using std::setprecision;
using std::fixed;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<long long> vl;
typedef string S;

unsigned long long min(unsigned long long a, unsigned long long b) {return a < b ? a : b;}
ll min(ll a, ll b) {return a < b ? a : b;}
ll min(int a, ll b) {return a < b ? a : b;}
ll min(ll a, int b) {return a < b ? a : b;}
ll min(int a, int b) {return a < b ? a : b;}

ll max(ll a, ll b) {return a > b ? a : b;}
ll max(int a, ll b) {return a > b ? a : b;}
ll max(ll a, int b) {return a > b ? a : b;}
ll max(int a, int b) {return a > b ? a : b;}


inline int nextInt()
{
    int x = 0;
    char c = getchar();
    int mi = (c == '-');
    if (c == '-') c = getchar();
    while ('0' <= c && c <= '9')
    {
        x = 10 * x + c - '0';
        c = getchar();
    }
    if (mi) return x * -1;
    return x;
}

#define F(i, n) for (int (i) = 0; (i) != (n); (i)++)
#define fi first
#define se second
#define re return
#define all(x) (x).begin(), (x).end()

namespace MySpace{
    struct CartesianTree{
        struct Node{
            int x, y;
            ll summ;
            int sz;
            Node * L, * R;
        };

        Node * NewNode(int x)
        {
            Node * R = new Node();
            R->summ = x;
            R->x = x;
            R->y = (1 << 15) * rand() + rand();
            R->sz = 1;
            return R;
        }

        void describe(Node * Nd)
        {
            if (!Nd) return;
            describe(Nd->L);
            cout << Nd->x << " ";
            describe(Nd->R);
        }

        int get_sz(Node * Nd)
        {
            if (Nd) re Nd->sz; re 0;
        }

        ll get_summ(Node * Nd)
        {
            if (Nd) re Nd->summ; re 0;
        }

        ll update(Node * Nd)
        {
            Nd->summ = Nd->x + get_summ(Nd->L) + get_summ(Nd->R);
            Nd->sz = 1 + get_sz(Nd->L) + get_sz(Nd->R);
        }

        Node * Merge(Node * L, Node * R)
        {
            if (!L) return R;
            if (!R) return L;
            if (L->y < R->y)
            {
                L->R = Merge(L->R, R);
                update(L);
                return L;
            }
            else
            {
                R->L = Merge(L, R->L);
                update(R);
                return R;
            }
        }

        pair<Node *, Node *> Split(Node * Scope, int k)
        {
            if (!Scope) return {nullptr, nullptr};
            if (Scope->x <= k)
            {
                pair<Node *, Node *> a = Split(Scope->R, k);
                Scope->R = a.first;
                update(Scope);
                return {Scope, a.second};
            }
            else
            {
                pair<Node *, Node *> a = Split(Scope->L, k);
                Scope->L = a.second;
                update(Scope);
                return {a.first, Scope};
            }
        }

        pair<Node *, Node *> SplitSize(Node * Scope, int k)
        {
            if (!Scope) return {nullptr, nullptr};
            if (get_sz(Scope->L) < k)
            {
                pair<Node *, Node *> a = SplitSize(Scope->R, k - get_sz(Scope->L) - 1);
                Scope->R = a.first;
                update(Scope);
                return {Scope, a.second};
            }
            else
            {
                pair<Node *, Node *> a = SplitSize(Scope->L, k);
                Scope->L = a.second;
                update(Scope);
                return {a.first, Scope};
            }
        }

        void Add(Node *& Root, int x)
        {
            Node * Nd = NewNode(x);
            pair<Node *, Node *> a = Split(Root, x);
            a.first = Merge(a.first, Nd);
            Root = Merge(a.first, a.second);
        }
    };
    ll inq(ll x, ll q, ll mod)
    {
        if (q == 0) return 1;
        ll l = inq(x, q / 2, mod);
        if (q % 2) return l * l % mod * x % mod;
        return l * l % mod;
    }
};

using namespace MySpace;


int n;
int a[500], b[500], c[500];
int A, B;

int dp[1000][1000];

signed main()
{
    srand(time(NULL));
    //freopen("", "r", stdin);
    //freopen("", "w", stdout);
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> A >> B;
    F(i, 1000) F(j, 1000) dp[i][j] = 1e9;
    dp[0][0] = 0;
    F(i, n)
    {
        cin >> a[i] >> b[i] >> c[i];
        for (int a1 = 499; a1 >= 0; a1--)
        {
            for (int b1 = 499; b1 >= 0; b1--)
            {
                if (dp[a1][b1] < 1e9) dp[a1 + a[i]][b1 + b[i]] = min(dp[a1 + a[i]][b1 + b[i]], dp[a1][b1] + c[i]);
            }
        }
    }
    ll ans = 1e9;
    F(a1, 500)
    {
        F(b1, 500)
        {
            if (a1 * B == b1 * A && a1 != 0)
            {
                ans = min(ans, dp[a1][b1]);
            }
        }
    }
    if (ans == 1e9) cout << -1;
    else cout << ans;
}


Measured memory_bytes: 4224