// Slower C++ solution:
#include <cstring>

#include <sstream>

#include <cstdio>

#include <algorithm>

#include <iostream>

#include <vector>

#include <map>

#include <unordered_map>

#include <cmath>

#include <queue>

#include <set>

#include <stack>



using namespace std;

typedef long long ll;

typedef pair<int, int> P;

#define rep(i, n) for(ll i = 0; i < (ll)(n); i++)

#define repr(i, n) for(ll i = n - 1; i >= 0; i--)

#define repone(i, n) for(ll i = 1; i <= (ll)(n); i++)

#define each(i, mp) for(auto i:mp)

const int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};

const ll mod = 1000000007;

const ll inf = ll(1e9);

const ll half_inf = ll(1e5);

const ll ll_inf = ll(1e9) * ll(1e9);



unordered_map<ll, ll> mp;

ll n, ma, mb;

vector<ll> a, b, c;



void solve() {

    ll dp[n + 1][500][500]; // dp[i][j][k] = i番目まででaをj個，bをk個選んだ時の最小コスト．

    rep(i, n + 1) rep(j, 500) rep(k, 500) dp[i][j][k] = inf;

    dp[0][0][0] = 0;

    rep(i, n) {

        rep(j, 500) {

            rep(k, 500) {

                dp[i + 1][j][k] = min(dp[i + 1][j][k], dp[i][j][k]);

                if (j >= a[i] && k >= b[i]) {

                    dp[i + 1][j][k] = min(dp[i + 1][j][k], dp[i][j - a[i]][k - b[i]] + c[i]);

                }

            }

        }

    }



    ll ans = inf;

    repone(i, 400) {

        repone(j, 400) {

            if (i * mb == ma * j) {

                ans = min(dp[n][i][j], ans);

            }

        }

    }

    cout << (ans == inf ? -1 : ans) << endl;

}



int main() {

#ifdef MY_DEBUG

#pragma clang diagnostic push

#pragma clang diagnostic ignored "-Wmissing-noreturn"

    while (true) {

        mp = unordered_map<ll, ll>();

#pragma clang diagnostic pop

#endif



        cin >> n >> ma >> mb;

        a.resize(n), b.resize(n), c.resize(n);

        rep(i, n) cin >> a[i] >> b[i] >> c[i];

        solve();



#ifdef MY_DEBUG

    }

#endif

    return 0;

}

// Faster C++ solution for the same problem (measured speedup: 4.633893244325106x):
#include <cstring>

#include <sstream>

#include <cstdio>

#include <algorithm>

#include <iostream>

#include <vector>

#include <map>

#include <unordered_map>

#include <cmath>

#include <queue>

#include <set>

#include <stack>

#include <numeric>



using namespace std;

typedef long long ll;

#define rep(i, n) for(ll i = 0; i < (ll)(n); i++)

#define repr(i, n) for(ll i = n - 1; i >= 0; i--)

#define repone(i, n) for(ll i = 1; i <= (ll)(n); i++)

#define each(i, mp) for(auto i:mp)

const int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};

const ll mod = 1000000007;

const ll inf = ll(1e9);

const ll half_inf = ll(1e5);

const ll ll_inf = ll(1e9) * ll(1e9);

typedef unordered_map<ll, ll> ump;

typedef pair<ll, ll> P;



ump mp;



void solve() {

}



int main() {

#ifdef MY_DEBUG

#pragma clang diagnostic push

#pragma clang diagnostic ignored "-Wmissing-noreturn"

    while (true) {

        mp = ump();

#pragma clang diagnostic pop

#endif

        ll n, ma, mb;

        cin >> n >> ma >> mb;

        vector<ll> a(n), b(n), c(n);

        rep(i, n) cin >> a[i] >> b[i] >> c[i];

        ll suma = accumulate(a.begin(), a.end(), 0);

        ll sumb = accumulate(b.begin(), b.end(), 0);

        ll dp[n + 1][suma + 100][sumb + 100];

        rep(k, n + 1) rep(i, suma + 100)rep(j, sumb + 100) dp[k][i][j] = ll_inf;

        dp[0][0][0] = 0;

        rep(k, n) {

            rep(i, suma + 1) {

                rep(j, sumb + 1) {

                    dp[k + 1][i][j] = min(dp[k + 1][i][j], dp[k][i][j]);

                    if (i >= a[k] && j >= b[k]) {

                        if (dp[k][i - a[k]][j - b[k]] != ll_inf) {

                            dp[k + 1][i][j] = min(dp[k + 1][i][j],

                                                  dp[k][i - a[k]][j - b[k]] + c[k]);

                        }

                    }

                }

            }

        }

        ll ans = ll_inf;

        repone(i, suma) {

            repone(j, sumb) {

                if (i * mb == j * ma) ans = min(ans, dp[n][i][j]);

            }

        }

        if (ans == ll_inf)cout << -1 << endl;

        else cout << ans << endl;



        solve();



#ifdef MY_DEBUG

    }

#endif

    return 0;

}