#![allow(unused, non_snake_case, dead_code, non_upper_case_globals)]
use std::cmp::*;
use std::collections::*;
use std::mem::*;

fn main() {
    let (r, w, e) = (std::io::stdin(), std::io::stdout(), std::io::stderr());
    let mut io = IO::new(r.lock(), w.lock(), e.lock());
    assert_eq!(!0usize, std::usize::MAX); //🙊

    let (n, ma, mb):(usize,i64, i64) = (io.read(), io.read(), io.read());
    let mut abc = Vec::new();
    let mut abc2 = Vec::new();
    for _ in 0..n/2 {
        let (a,b,c) = (io.read::<i64>(),io.read::<i64>(),io.read::<i64>());
        abc.push((a,b,c));
    }

    for _ in n/2..n {
        let (a,b,c) = (io.read::<i64>(),io.read::<i64>(),io.read::<i64>());
        abc2.push((a,b,c));
    }
    // abc.sort();
    // abc2.sort();
    let n1 = abc.len();
    let n2 = abc2.len();
    io.debug(&abc);
    io.debug(&abc2);


    let mut abcm1 = Vec::new();
    let mut cost1 = vec![INF;10001];
    let mut cost2 = vec![INF;10001];
    let base = 5000usize;
    for i in 1..(1<<n1) {
        let mut a=0;
        let mut b=0;
        let mut c=0;
        let mut aa = base as i64;
        for j in 0..n1 {
            if (i >>j & 1) == 1 {
                aa += (mb * abc[j].0 - ma * abc[j].1);
                a += abc[j].0;
                b += abc[j].1;
                c += abc[j].2;
            }
        }
        abcm1.push((a,b,c));
        cost1[aa as usize] = min(cost1[aa as usize],c);

    }
    let mut abcm2 = Vec::new();
    for i in 1..1<<n2 {
        let mut a=0;
        let mut b=0;
        let mut c=0;
        let mut aa = base as i64;
        for j in 0..n2 {
            if (i >>j & 1) == 1 {
                aa += (mb * abc2[j].0 - ma * abc2[j].1) ;
                a += abc2[j].0;
                b += abc2[j].1;
                c += abc2[j].2;
            }
        }
        cost2[aa as usize] = min(cost2[aa as usize],c);
        abcm2.push((a,b,c));
    }
    io.debug2(cost1[base],cost2[base]);
    let mut ans = min(cost1[base],cost2[base]);

    for i in 0..10000 {
        ans = min(ans, cost1[i] + cost2[2*base-i]);
    }
    if ans >= INF{
        ans = -1;}
        io.writeln(ans);

    




}

static MOD: i64 = 1000000007;
static INF: i64 = std::i64::MAX >> 1;
// IO
use std::io::*;
struct IO<R: Read, W: Write, E: Write> {
    Read: R,
    Write: BufWriter<W>,
    Error: BufWriter<E>,
}
impl<R: Read, W: Write, E: Write> IO<R, W, E> {
    fn new(r: R, w: W, e: E) -> IO<R, W, E> {
        IO {
            Read: r,
            Write: BufWriter::new(w),
            Error: BufWriter::new(e),
        }
    }
    fn read<T>(&mut self) -> T
    where
        T: std::str::FromStr,
    {
        let next: String = self
            .Read
            .by_ref()
            .bytes()
            .map(|c| c.unwrap() as char)
            .skip_while(|c| c.is_whitespace())
            .take_while(|c| !c.is_whitespace())
            .collect();
        next.parse().ok().unwrap()
    }
    fn chars(&mut self) -> Vec<char> {
        self.read::<String>().chars().collect()
    }
    fn chari(&mut self) -> Vec<i64> {
        self.chars()
            .iter()
            .map(|&c| (c as u8 - b'0') as i64)
            .collect::<Vec<i64>>()
    }
    fn readn<T: std::str::FromStr>(&mut self, n: usize) -> Vec<T> {
        (0..n).map(|_| self.read::<T>()).collect::<Vec<_>>()
    }
    fn readmat<T: std::str::FromStr>(&mut self, n: usize, m: usize) -> Vec<Vec<T>> {
        (0..n).map(|_| self.readn(m)).collect()
    }
    fn write<S: ToString>(&mut self, val: S) {
        self.Write.write(val.to_string().as_bytes());
    }
    fn writeln<S: ToString>(&mut self, val: S) {
        self.Write.write(val.to_string().as_bytes());
        self.Write.write(b"\n");
    }
    fn debug<S: std::fmt::Debug>(&mut self, val: S) {
        writeln!(self.Error, "(debug) {:?}", &val);
    }
    fn debug2<S: std::fmt::Debug, T: std::fmt::Debug>(&mut self, val1: S, val2: T) {
        writeln!(self.Error, "(debug2) {:?} -> {:?}", val1, val2);
    }
    fn debug3<S: std::fmt::Debug, T: std::fmt::Debug, U: std::fmt::Debug>(
        &mut self,
        val1: S,
        val2: T,
        val3: U,
    ) {
        writeln!(
            self.Error,
            "(debug3) {:?} -> {:?} -> {:?}",
            val1, val2, val3
        );
    }
}


Measured memory_bytes: 55540