using System;
class URI {
static void Main(string[] args) {
int x=Convert.ToInt32(Console.ReadLine());
int y=Convert.ToInt32(Console.ReadLine());
int A;
int B;
if(x>y)
{
A=x;
B=y;
}
else
{
A=y;
B=x;
}
int sum=0;
for(int i=B+1;i<A;i++){
if(i%2!=0){
sum=sum+i;
}
}
Console.WriteLine(sum);
}
}
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