This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
/**
* author: wxhtzdy
* created: 08.08.2022 18:38:51
**/
#include <bits/stdc++.h>
using namespace std;
template <typename T>
class fenwick {
public:
vector<T> fenw;
int n;
fenwick(int _n) : n(_n) {
fenw.resize(n);
}
void modify(int x, T v) {
while (x < n) {
fenw[x] += v;
x |= (x + 1);
}
}
T get(int x) {
T v{};
while (x >= 0) {
v += fenw[x];
x = (x & (x + 1)) - 1;
}
return v;
}
};
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int n;
long long k;
cin >> n >> k;
vector<int> h(n);
vector<long long> g(n);
for (int i = 0; i < n; i++) {
cin >> h[i] >> g[i];
}
auto xs = h;
sort(xs.begin(), xs.end());
xs.erase(unique(xs.begin(), xs.end()), xs.end());
for (int i = 0; i < n; i++) {
h[i] = lower_bound(xs.begin(), xs.end(), h[i]) - xs.begin();
}
int x = max(1, n / 2);
int y = n - x;
vector<pair<long long, int>> v;
v.emplace_back(-1e18, 0);
for (int mask = 0; mask < (1 << x); mask++) {
int mx = 0;
bool ok = true;
long long sum = 0;
for (int i = 0; i < x; i++) {
if (mask >> i & 1) {
if (mx > h[i]) {
ok = false;
break;
}
sum += g[i];
mx = h[i];
}
}
if (!ok) {
continue;
}
v.emplace_back(sum, mx);
}
sort(v.begin(), v.end());
int m = (int) v.size();
vector<vector<int>> qs(m + 1);
for (int mask = 0; mask < (1 << y); mask++) {
int mx = -1;
bool ok = true;
long long sum = 0;
for (int i = 0; i < y; i++) {
if (mask >> i & 1) {
if (mx > h[x + i]) {
ok = false;
break;
}
sum += g[x + i];
mx = h[x + i];
}
}
if (!ok) {
continue;
}
int idx = lower_bound(v.begin(), v.end(), make_pair(k - sum, -1)) - v.begin();
qs[idx].push_back((mx == -1 ? n - 1 : mx));
}
long long ans = 0;
fenwick<int> fenw(n);
for (int i = m - 1; i >= 0; i--) {
fenw.modify(v[i].second, 1);
for (auto& p : qs[i]) {
ans += fenw.get(p);
}
}
cout << ans << '\n';
return 0;
}
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