#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    long long N,X,Y; cin >> N >> X >> Y;
    vector<pair<long long,long long>> V;
    while(N--){
        long long w,v,c; cin >> w >> v >> c;
        while(c){
            if(!(c&1)) V.push_back({v,w}),c--;
            V.push_back({v,w}),c--;
            c >>= 1,v <<= 1,w <<= 1;
        }
    }
    N = V.size();

    double low = 0,high = 1000;
    for(int t=0; t<60; t++){
        double mid = (high+low)/2;
        vector<double> dp(X,-1e18);
        for(auto [v,w] : V){
            auto next = dp;
            double add = v-mid*w;
            add += w/X*Y,w %= X;
            next.at(w) = max(next.at(w),add);
            for(int i=0; i<X; i++){
                int to = i+w;
                if(to >= X) add += Y;
                next.at(to%X) = max(next.at(to%X),dp.at(i)+add);
                if(to >= X) add -= Y;
            }
            swap(dp,next);
        }


        if(*max_element(dp.begin(),dp.end()) >= 0) low = mid;
        else high = mid;
    }
    cout << fixed << setprecision(20) << low << endl;
}