#include<bits/stdc++.h>
using namespace std;

int answer(int s1[],int s2[],int s3[],int n1,int n2,int n3){
	int ans=99999;
	int d;
	for(int i=0;i<n1;i++)
		for(int j=0;j<n2;j++)
			for(int k=0;k<n3;k++){
				d=sqrt((s1[i]-s2[j])*(s1[i]-s2[j]))+sqrt((s2[j]-s3[k])*(s2[j]-s3[k]))+sqrt((s3[k]-s1[i])*(s3[k]-s1[i]));
				if(d<ans)
					ans=d;
			}
	return ans;
}

int main(){
	int s1[3]={-1,0,9};
	int s2[4]={-25,-10,10,11};
	int s3[5]={2,9,17,30,41};
	cout << answer(s1,s2,s3,3,4,5) << "\n";
}