#9 maxmin

#include <iostream>
using namespace std;
int a,b;
int main(){
int a,b,c,x,y,m,n,p;
cin>>a >>b >>c;
{if (a>b)
 x=a;
else
 x=b;
}
{if (x>c)
 y=x;
else
 y=c;
}
{if (a<b)
 m=a;
else
 m=b;
}
{if (m<c)
 n=m;
else
 n=c;
}
cout<<y-n;
return 0;
}