Submission #4044513

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Source Code Expand

#include <cstring>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <queue>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cassert>

#define ios ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
#define S second
#define F first
#define pb push_back
#define nl '\n'
#define NL cout << '\n';
#define EX exit(0)
#define all(s) s.begin(), s.end()
#define FOR(i, start, finish, k) for(int i = start; i <= finish; i += k)

const long long MXN = 3e5 + 1;
const long long MNN = 1e5 + 1;
const long long MOD = 1e9;
const long long INF = 1e18;
const long long OO = 1e9 + 500;

typedef long long llong;
typedef unsigned long long ullong;

using namespace std;

llong x;

int main(){
	ios;
	cin >> x;
	llong a = x / 2;
	llong b = (x + 1) / 2;
	cout << a * b;
	return 0;
}

/*

6
4 -2 -5 10 5 1
1 2
2 4
2 5
1 3
3 6
 
*/

Submission Info

Judge Result