This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
//#pragma optimize("Ofast")
//#pragma optimize("unroll-loops")
//#pragma traget("avx,avx2")
#include <iostream>
#include <cmath>
#include <algorithm>
#include <stdio.h>
#include <cstdint>
#include <cstring>
#include <string>
#include <cstdlib>
#include <vector>
#include <bitset>
#include <map>
#include <queue>
#include <ctime>
#include <stack>
#include <set>
#include <list>
#include <random>
#include <deque>
#include <functional>
#include <iomanip>
#include <sstream>
#include <fstream>
#include <complex>
#include <numeric>
#include <cassert>
#include <array>
#include <tuple>
#include <unordered_map>
#include <unordered_set>
#include <thread>
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
#define el '\n'
#define ff first
#define ss second
#define pb push_back
#define pf push_front
#define popb pop_back
#define popf pop_front
#define point pair <ll, ll>
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
using namespace std;
#include <random>
mt19937 rnd(time(0));
const ll INF = 1e18 + 10;
const ll inf = 1e9 + 10;
const ll N = 1e6 + 10;
const ll mod = 1e9 + 7;
const ll LOG = 20;
const ll K = 1e3 + 20;
void solve() {
ll n, k;
cin >> n >> k;
vector <ll> a(n), b(n);
for (ll i = 0; i < n; i++)
cin >> a[i] >> b[i];
vector <ll> order;
for (ll i = 0; i < n; i++)
if (b[i] != -1)
order.pb(i);
sort(all(order), [&](const ll &i, const ll &j) -> bool {
if (b[i] == b[j])
return a[i] < a[j];
return b[i] < b[j];
});
ld ans = inf, cur = 0;
ll cnt = 1;
for (ll i = -1; i < (ll)order.size(); i++) {
if (i != -1) {
cur += (ld)b[order[i]] / (ld)cnt;
cnt++;
}
vector <bool> used(n);
for (ll j = 0; j <= i; j++)
used[order[j]] = 1;
vector <ll> c;
for (ll j = 0; j < n; j++)
if (!used[j])
c.pb(a[j]);
sort(all(c));
ll sum = 0;
for (ll j = 0; j < k - i - 1; j++)
sum += c[j];
ld now = cur + (ld)sum / (ld)cnt;
ans = min(ans, now);
}
cout << fixed << setprecision(15) << ans << el;
return;
}
signed main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int tests = 1;
//cin >> tests;
while (tests--)
solve();
return 0;
}
/*
*/
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