neparenZbir

#include <iostream>

using namespace std;

int main()
{
    int br1, br2, sum = 0;
    cin >> br1 >> br2;
    for( ; br1<=br2; br1++)
    {
        if(br1%2 != 0) sum+=br1;
    }
    cout << sum;
    return 0;
}