/*
Wrong Answer
*/

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;

int main(){
    ll n, h; cin >> n >> h;
    ld ans = 1e18;
    vector<ll> xs(n), ys(n);
    for (int i = 0; i < n; i++) cin >> xs[i] >> ys[i];
    ll rx = 0;
    for (int i = 0; i < n; i++) rx = max(rx,xs[i]);
    for (int fy = 0; fy <= 500; fy++) for (int gy = 0; gy <= 500; gy++){
        ld cur = 0;
        for (int i = 0; i < n; i++){
            ld fv = ys[i] - ld(fy-h)/rx*xs[i] - h;
            ld gv = ys[i] - ld(gy)/rx*xs[i];
            cur += min(fv*fv,gv*gv);
        }
        ans = min(ans,cur);
    }
    cout << fixed << setprecision(15) << ans << endl;
}