文件目录

#include <iostream>
using namespace std;
int main()
{
    int m, n;
    cin >> m >> n;
    int s = 0;
    if (m % 2 == 0)
        m++;
    for (int i = m; i <= n; i += 2)
        s += i;
    cout << s;
    return 0;
}