impar.cpp

// Autor: Roger Benet da Silva Souza - IFMT-BAG
#include <bits/stdc++.h>
using namespace std;

int x,y,s;

int main(){
    scanf("%d %d", &x ,&y);
    for(int i = min(x,y) + 1; i < max(x,y); i++)if(i%2 != 0)s += i;
    printf("%d\n",s);
    return 0;
}