Submission

Score: 100

User: kakcode

Problemset: ผลรวมตัวเลข

Language: cpp

Time: 0.003 second

Submitted On: 2025-11-11 21:54:29

/*
TASK: c1_bkk64_1
LANG: C++
AUTHOR: ICE
*/
#include <bits/stdc++.h>
using ll = long long;
#define forr(i, a, n) for (int i = a; i < n; i++)
const ll inf = 10e9;
#define int ll
using namespace std;
using pii = pair<int,int>;
int prefix[1001];
signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n,m;
    cin >> n >> m;
    int sum = 0;
    for(int i=1;i<1001;i++){
        if(i%2 == 0||i%3 == 0)sum+=i;
        prefix[i] = sum;
    }   
    //for(int i=0;i<15;i++)cout << prefix[i] << ' ';
    cout << prefix[m-1] - prefix[n-1];
    return 0;
}