// Online C++ Compiler - Build, Compile and Run your C++ programs online in your favorite browser
 
#include<iostream>
 
using namespace std;
 
int main()
{
    int x,y,z;
    cin >> x >> y >> z;
 
    int d1 = (x-y)-(x-z);
    if(d1 < 0) d1 = -1 * d1;
 
    int d2 = (y-x)-(y-z);
    if(d2 < 0) d2 = -1 * d2;
 
    int d3 = (z-x)-(z-y);
    if(d3 < 0) d3 = -1 * d3;
 
    if(d1 <= d2 and d1 <= d3) cout << d1*2;
    else if(d2 <= d1 and d2 <= d3) cout << d2*2;
    else cout << d3*2;
 
    return 0;
}
 

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