#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
int main(void)
{
int input1;
int input2;
while(scanf("%d %d",&input1,&input2)!=EOF)
{
input1 = input1 + input1 % 2;
input2 = input2 - input2 % 2;
printf("%d\n",(input2-input1)/2+1);
}
return 0;
}
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