#include <iostream>
using namespace std;
int main() {
int x1, x2, x3, c=0, r=0;
cin >>x1 >>x2 >>x3;
r =x1+x2+x3;
r=r/3;
if (x1<=r){
x1=r-x1;
}
else {
x1 = x1-r;
}
if (x2<=r){
x2=r-x2;
}
else {
x2 = x2-r;
}
if (x3<=r){
x3=r-x3;
}
else {
x3 = x3-r;
}
cout <<x1+x2+x3;
return 0;
}
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