#include <iostream>
#include <math.h>
using namespace std;
void nhap_bien(int n, int x) {
    cout << "Nhap n: ";
    cin >> n;
    cout << "Nhap x: ";
    cin >> x;
}
void bai_toan(int n, int x, float P) {
    if (n <= 10) {
        int mau;
        for (int i=1; i<=n; i++) {
            mau += i;
            P += (x-i)/mau;
        }
    } else {
        P = 2020*x + sqrt(pow(n,3));
    }
    cout << "P = " << P;
}
int main()
{
    int n,x;
    float P;
    cout << "Nhap n: ";
    cin >> n;
    cout << "Nhap x: ";
    cin >> x;
    bai_toan(n,x,P);
    return 0;
}