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: 03.07.2022 11:30:53
**/
#include <bits/stdc++.h>
using namespace std;
typedef long double ldb;
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int n, h;
cin >> n >> h;
vector<int> x(n), y(n);
for (int i = 0; i < n; i++) {
cin >> x[i] >> y[i];
}
vector<tuple<ldb, int, int>> ev;
for (int i = 2; i < n - 1; i += 2) {
ldb L = (ldb) x[i] + (ldb) h * (((ldb) x[i - 1] - x[i] + 0.00) / (ldb) (y[i - 1] - y[i] + 0.00));
ldb R = (ldb) x[i] + (ldb) h * (((ldb) x[i + 1] - x[i] + 0.00) / (ldb) (y[i + 1] - y[i] + 0.00));
ev.emplace_back(L, 0, i);
ev.emplace_back(R, 1, i);
}
sort(ev.begin(), ev.end());
set<int> st;
int ans = 0;
for (auto& p : ev) {
if (get<1>(p) == 0) {
st.insert(get<2>(p));
} else {
if (st.find(get<2>(p)) != st.end()) {
st.clear();
ans += 1;
}
}
}
cout << ans << '\n';
return 0;
}
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