// yuki 965 門松列が嫌い
// 2019.1.13 bal4u

#include <stdio.h>

int getchar_unlocked(void);
#define gc() getchar_unlocked()

int in() {   // 非負整数の入力
	int n = 0, c = gc();
	do n = 10 * n + (c & 0xf); while ((c = gc()) >= '0');
	return n;
}

#define ABS(a)  ((a)>=0?(a):-(a))
#define MIN(a,b) ((a)<=(b)?(a):(b))

int main()
{
	int A, B, C, ans;
	
	A = in(), B = in(), C = in();
	ans = MIN(ABS(A-B), ABS(B-C));
	ans = MIN(ans, ABS(A-C));
	printf("%d\n", ans);
	return 0;
}