0分，大佬帮忙

#include<bits/stdc++.h>
using namespace std;
int k,n,m; 
int main(){
	cin>>n>>m;
	if(n%2==0) n++;
	if(m%2==0) m--;
	k=(m-n)/2+1;
	cout<<(n+m)*k/2;
}