#include<bits/stdc++.h>
using lint=long long;
void cmn(lint&x,lint y){if(x>y)x=y;}
int main(){
    std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);
    std::cout.setf(std::ios_base::fixed);std::cout.precision(15);
    lint a,b,x;std::cin>>a>>b>>x;
    lint ans=0;
    if(x==1||std::abs(a-x)<=std::abs(b-x)){
        ans+=std::abs(a-x);a=x;
        ans+=x;a=x=0;
    }else{
        auto cal=[a,b,x](lint y)mutable{
            lint now=0;
            now+=std::abs(x-b);b=x;
            now+=std::abs(x-y);b=x=y;
            now+=std::abs(x-a);a=x;
            now+=a;a=x=0;
            return now;
        };
        ans=cal(1);
        if(a!=0)cmn(ans,cal(a));
    }
    std::cout<<ans<<'\n';
}