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>
#include <time.h>
//#include <random>
#define sz(x) int(x.size())
#define in(x) freopen(x, "r", stdin)
#define out(x) freopen(x, "w", stdout)
#define N 100500
#define oo ll(1e16)
#define pii pair <int, int>
#define pll pair <ll, ll>
#define ft first
#define sd second
#define pb push_back
#define ppb pop_back
#define el '\n'
#define elf endl
#define base ll(1e9 + 7)
#define re return
#define nins 4294967295
using namespace std;
typedef long long ll;
typedef long double ld;
//mt19937 rnd(0);
ll n, k;
vector <pll> v;
priority_queue <ll> q;
void solve() {
cin >> n >> k;
for (int i = 0; i < n; i++) {
ll x, y; cin >> x >> y;
v.pb({x, y});
}
for (int i = 0; i < n; i++)
swap(v[i].ft, v[i].sd);
sort(v.begin(), v.end());
for (int i = 0; i < n; i++)
swap(v[i].ft, v[i].sd);
ll ans = oo * 100ll, sum = 0;
for (int i = 0; i < n; i++) {
q.push(v[i].ft);
sum += v[i].ft;
if (sz(q) < k)
continue;
if (sz(q) > k) {
sum -= q.top();
q.pop();
}
ans = min(ans, sum * v[i].sd);
}
cout << ans;
}
int main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#ifdef _LOCAL
in("input.txt");
int t = 1;
// cin >> t;
for (int i = 1; i <= t; i++) {
cout << "Test #" << i << elf;
clock_t start_time = clock();
solve();
cerr.precision(4); cerr << fixed;
cerr << elf;
cerr << "Time :: " << ld(clock() - start_time) / CLOCKS_PER_SEC << elf;
cout << elf;
}
#else
int t = 1;
// cin >> t;
while (t--) {
solve();
cout << el;
}
#endif
}
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