#include <iostream>
using namespace std;
int main() {
    freopen("sotnn.inp", "r", stdin);
    freopen("sotnn.out", "w", stdout);
    long long n;
    cin >> n;
    long long t1=0,t2= 0,t3=0;
    int d1=0,d2=0;
    for (int i=1;i<=n;++i) {
        if (i%2==0) {
            t1+= i;
            d1++;
        } else {
            t2+=i;
            d2++;
        }
        t3+=i;
    }
    cout<<"Tong va trung binh cac so chan nho hon n la: "<<t1<<" "<<t1/d1<<'\n';
    cout<<"Tong va trung binh cac so le nho hon n la: "<<t2<<" "<< t2/d2<<'\n';
    cout<<"Tong va trung binh cac so nho hon n la: " <<t3<<" "<<t3/n<<'\n';
    return 0;
}

$\color{blue}{\text{Codyy}}$

#include <bits/stdc++.h>
using namespace std;
long long n, s = 0, s1 = 0, s2 = 0, d = 0, d1 = 0;
int main()
{
    freopen("sotnn.inp", "r", stdin);
    freopen("sotnn.out", "w", stdout);
    cin >> n;
    for (int i = 1; i <= n; ++i)
    {
        if (i % 2 == 0) 
        {
            s += i;
            d++;
        }
        else if (i % 2 != 0)
        {
            s1 += i;
            d1++;
        }
        s2 += i;
    }
    cout << "Tong va trung binh cac so chan nho hon n la: " << s << " " << s / d << '\n';
    cout << "Tong va trung binh cac so le nho hon n la: " << s1 << " " << s1 / d1 << '\n';
    cout << "Tong va trung binh cac so nho hon n la: " << s2 << " " << s2 / n << '\n';
}