#include <bits/stdc++.h>
// #include <boost/multiprecision/cpp_int.hpp>
using namespace std;
// using bigint = boost::multiprecision::cpp_int;

template <typename T> using min_priority_queue = priority_queue<T,vector<T>,greater<T>>;

random_device seed_gen;
mt19937 engine(seed_gen());

int64_t get_time_ns(){
    struct::timespec t;
    clock_gettime(CLOCK_MONOTONIC, &t);
    return t.tv_sec * int64_t(1'000'000'000) + t.tv_nsec;
}

int main() {
    int64_t n;
    cin >> n;

    int64_t ans;
    if(n % 2 == 0) {
        ans = n / 2 * (n - 2) / 2;
    }
    else {
        ans = (n - 1) / 2 * (n - 1) / 2;
    }

    cout << ans << endl;
    return 0;
}