#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int a, b, c, m;
cin>>a>>b>>c;
m=abs(a-b);
if (abs(a-c)>m)
m=abs(a-c);
if (abs(b-c)>m)
m=abs(b-c);
cout<<m;
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8Y21hdGg+Cgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKQp7CiAgICBpbnQgYSwgYiwgYywgbTsKICAgIGNpbj4+YT4+Yj4+YzsKCiAgICBtPWFicyhhLWIpOwogICAgaWYgKGFicyhhLWMpPm0pCiAgICAgICAgbT1hYnMoYS1jKTsKICAgIGlmIChhYnMoYi1jKT5tKQogICAgICAgIG09YWJzKGItYyk7CiAgICBjb3V0PDxtOwoKICAgIHJldHVybiAwOwp9Cg==