#include <stdio.h>

#include <stdlib.h>

int main(void){

double num1, num2;

double max, min;

int k=0;

scanf("%lf %lf", &num1, &num2);

if (num1>num2){

max = num1;

min= num2;

}

else

{

min = num1;

max= num2;

}

k = int(max)-int(min);

//if (int(max)==max || int(min)==min) k=k-1;

if (int(max)==max ) k=k-1;

printf("%d", k);

system("pause");

return 0;

}