ngôn ngữ c++ vòng lặp while

`color(#FFFFFFff)(H)color(#E7E7E7ff)(o)color(#CFCFCFff)(r)color(#B7B7B7ff)(i)color(#9F9F9Fff)(z)color(#878787ff)(o)color(#6F6F6Fff)(n)`

#include <iostream>
using namespace std;

int main() {
    int n, i = 1; cin >> n; long long sum = 0;
    while (i <= n) {sum += 1000*(i+1); i++;}
    cout << sum;
}

#include <bits/stdc++.h>

using namespace std;

int main(){
    int n, s, t = 2000;
    cin >> n;

    while(n!=0){
        s += t;
        t+=1000;
        n--;

    }
    cout << s;
    return 0;
}

Chúc Cậu Học Tốt :3