#include <bits/stdc++.h>
#define int long long
const int MAXN = 501;
long double dp[MAXN][MAXN];
int32_t main() {
std::ios::sync_with_stdio(false);
std::cin.tie(0);
int n;
std::cin >> n;
int k;
std::cin >> k;
std::vector<std::pair<int, int>> b(n);
int cnt = 0;
bool tmp = true;
for (int i = 0; i < n; i++) {
std::cin >> b[i].first;
std::cin >> b[i].second;
if (b[i].second == -1) {
cnt++;
b[i].second = 1e4;
}
}
std::sort(b.begin(), b.end(),
[&](std::pair<int, int> a, std::pair<int, int> b) {
return a.second < b.second;
});
long double ans = 1e18;
for (int z = 0; z <= k; z++) {
for (int i = 0; i < MAXN; i++) {
for (int j = 0; j < MAXN; j++) {
dp[i][j] = 1e18;
}
}
dp[0][0] = 0;
for (int i = 1; i <= n; i++) {
for (int j = 0; j <= n; j++) {
// dp[i][j] = dp[i - 1][j];
if (j > 0 && b[i - 1].second != 1e4) {
// std::cout << i << ' ' << b[i - 1].second << std::endl;
dp[i][j] = std::min(
dp[i][j], dp[i - 1][j - 1] +
(long double)(b[i - 1].second) / (long double)(j));
}
if (k > 0) {
dp[i][j] =
std::min(dp[i][j], dp[i - 1][j] + (long double)(b[i - 1].first) /
(long double)(z + 1));
}
}
}
// std::cout << z << ' ' << dp[n][z][k - z] << std::endl;
ans = std::min(ans, dp[n][z]);
}
std::cout << std::setprecision(20) << std::fixed << ans;
}
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