use std::io::{stdin, Read, StdinLock};
use std::str::FromStr;
use std::iter::FromIterator;

#[allow(unused_macros)]
macro_rules! vecs {
    ($init:expr; $($dim:expr);*) => {
        vecs!($($dim);* => $init)
    };
    ($head:expr; $($tail:expr);* => $init:expr) => {
        vec![vecs!($($tail);* => $init); $head]
    };
    ($head:expr => $init:expr) => {
        vec![$init; $head]
    };
}

#[allow(unused_macros)]
macro_rules! chmax {
    ($x:expr, $y:expr) => {
        if $x < $y {
            $x = $y;
            true
        } else {
            false
        }
    };
}


#[allow(unused_macros)]
macro_rules! chmin {
    ($x:expr, $y:expr) => {
        if $x > $y {
            $x = $y;
            true
        } else {
            false
        }
    };
}

fn main() {
    let cin = stdin();
    let mut scan = Scanner::new(cin.lock());
    let n = scan.read::<usize>();
    let ma = scan.read::<usize>();
    let mb = scan.read::<usize>();
    let abc = arr(n, |_| (scan.read::<usize>(), scan.read::<usize>(), scan.read::<i64>()));
    let mut dp = vecs![1i64<<60;41;401;401];
    dp[0][0][0] = 0;
    for i in 0..n {
        let (a,b,c) = abc[i];
        for j in 0..dp[0].len() {
            for k in 0..dp[0][0].len() {
                chmin!(dp[i+1][j][k], dp[i][j][k]);
                if j+a<dp[0].len() && k+b<dp[0][0].len() {chmin!(dp[i+1][j+a][k+b], dp[i][j][k] + c);}
            }
        }
    }
    let mut ret = 1i64 << 60;
    for i in 0..dp[0].len() {
        for j in 0..dp[0][0].len() {
            if i == 0 && j == 0 {continue;}
            if i*mb == j*ma {chmin!(ret, dp[n][i][j]);}
        }
    }
    println!("{}", if ret==1i64<<60 {-1} else {ret});
}

// region template
#[allow(dead_code)]
fn iu(i: isize) -> usize { i as usize }

#[allow(dead_code)]
fn ui(i: usize) -> isize { i as isize }

#[allow(dead_code, deprecated)]
fn join<T: std::fmt::Display>(slice: &[T], sep: &str) -> String {
    let strings = slice.iter().map(|t| format!("{}", t)).collect::<Vec<_>>();
    strings.connect(sep)
}

#[allow(dead_code)]
fn arr<'a, S, T>(n: usize, mut f: S) -> Vec<T> where S: FnMut(usize) -> T + 'a {
    (0..n).map(|i| f(i)).collect::<Vec<T>>()
}

#[allow(dead_code)]
fn alt<S, T>(v: Vec<S>) -> T where T: FromIterator<S> {
    v.into_iter().collect::<T>()
}

#[allow(dead_code)]
fn dup<S, T>(v: &[S]) -> T where T: FromIterator<S>, S: Clone {
    v.iter().cloned().collect::<T>()
}

struct Scanner<'a> {
    cin: StdinLock<'a>,
}

#[allow(dead_code)]
impl<'a> Scanner<'a> {
    fn new(cin: StdinLock<'a>) -> Scanner<'a> {
        Scanner { cin: cin }
    }

    fn read1<T: FromStr>(&mut self) -> Option<T> {
        let token = self.cin.by_ref().bytes().map(|c| c.unwrap() as char)
            .skip_while(|c| c.is_whitespace())
            .take_while(|c| !c.is_whitespace())
            .collect::<String>();
        token.parse::<T>().ok()
    }

    fn read<T: FromStr>(&mut self) -> T {
        self.read1().unwrap()
    }

    fn readn<T: FromStr>(&mut self, n: usize) -> Vec<T> {
        (0..n).map(|_| self.read::<T>()).collect()
    }

    fn chars(&mut self) -> Vec<char> {
        self.read::<String>().chars().collect()
    }
}
// endregion

Measured memory_bytes: 63868