#include<stdio.h>
int main()
{
	int a, b, c;
	scanf("%d %d %d", &a, &b, &c);
	if (a < b)
	{
		a ^= b;
		b ^= a;
		a ^= b;
	}
	if (a < c)
	{
		a ^= c;
		c ^= a;
		a ^= c;
	}
	if (b < c)
	{
		b ^= c;
		c ^= b;
		b ^= c;
	}
	if (a - b > b - c)
		printf("%d\n", b - c);
	else
		printf("%d\n", a - b);
	return 0;
}