This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define forr(_a,_b,_c) for(_a = (_b); _a <= (_c); ++_a)
#define ford(_a,_b,_c) for(_a = (_b) + 1; _a --> (_c);)
#define forf(_a,_b,_c) for(_a = (_b); _a < (_c); ++_a)
#define st first
#define nd second
#define ll long long
#define ull unsigned long long
#define pii pair <int,int>
#define pll pair <ll,ll>
#define piii pair <int,pii>
#define vi vector <int>
#define pb push_back
#define mp make_pair
#define all(x) begin(x),end(x)
#define file "test"
using namespace std;
const int N = 1e6 + 5;
const ll oo = 1e9;
const ll mod = 1e9 + 7;
int n, ff, i;
pll a[N];
int main(){
ios_base::sync_with_stdio(0); cin.tie(0);
#ifdef hqm
freopen(file".inp", "r", stdin); freopen(file".out", "w", stdout);
#endif
cin >> n >> ff;
forr (i, 1, n)
cin >> a[i].st >> a[i].nd;
double l = 1, r = 2 * oo;
int cnt = 100;
while (cnt--){
double mid = (r + l) / 2, qq = 0;
forr (i, 1, n){
double dis = sqrt(mid * mid - a[i].nd * a[i].nd);
if (a[i].st - dis <= qq)
qq = max (qq, a[i].st + dis);
}
if (qq >= ff)
r = mid;
else l = mid;
}
cout << fixed << setprecision(5) << l;
return 0;
}
/*
*/
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