#include <bits/stdc++.h>
using namespace std;
int main(){
	int a,b;
	cin >> a >> b;
	if(a==0 and b==0){
		cout << 0;
	}else if(a==0){
		cout << abs(b);
	}else if(b==0){
		cout << abs(a);
	}else if(abs(a)==abs(b)){
		cout << abs(a)*2;
	}else if((a>0 and b>0) or (a<0 and b<0)){
		cout << max(abs(a),abs(b));
	}else{
		cout << 2*min(abs(a),abs(b))+max(abs(a),abs(b));
	}
}