#include <bits/stdc++.h>
#define rep(i,n) for(ll i=0;i<(n);i++)
#define rrep(i,n) for(ll i = 1; i <= (n); ++i)
#define drep(i,n) for(ll i = (n)-1; i >= 0; --i)
#define all(v) v.begin(),v.end()
#define len(x) (ll)(x).length()
#define maxs(x,y) x = max(x,y)
#define mins(x,y) x = min(x,y)
#define pb push_back
#define sz(x) (ll)(x).size()
#define v(T) vector<T>
#define vv(T) vector<vector<T>>
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<P> vp;
ll gcd(ll a,ll b){if(a%b==0){return b;}else{return(gcd(b,a%b));}}
ll lcm(ll a,ll b){return a/gcd(a,b)*b;}
const int INF=1e9;
const ll MX = 1e18;
const ll MOD=INF+7;
const int di[] = {-1,0,1,0};
const int dj[] = {0,-1,0,1};
const double PI=acos(-1);
#define dame { puts("-1"); return 0;}
#define yn {puts("Yes");}else{puts("No");}
#define YN {puts("YES");}else{puts("NO");}
const ll MAX = 1000001;
long long fac[MAX], finv[MAX], inv[MAX];
void COMinit() {fac[0] = fac[1] = 1;finv[0] = finv[1] = 1;inv[1] = 1;for (ll i = 2; i < MAX; i++){fac[i] = fac[i - 1] * i % MOD;inv[i] = MOD - inv[MOD%i] * (MOD / i) % MOD;finv[i] = finv[i - 1] * inv[i] % MOD;}}
long long COM(ll n, ll k){if (n < k) return 0;if (n < 0 || k < 0) return 0;return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;}
ll llpow(ll n,ll i){ll cnt=n;  for(ll j=0;j<i-1;j++){n*=cnt;}return n;}

int main(){
  int a,b;
  cin>>a>>b;
  ll cnt=0;
  if(a<=b){
    cout<<min(abs(abs(a)-abs(b))+1,b-a)<<endl;
    return 0;
  }
  if(a>b){
    if(a>0&&b>0){
      cout<<a-b+2<<endl;
      return 0;
    }
    if(a<0&&b<0){
      cout<<a-b+2<<endl;
      return 0;
    }
    else{
      cout<<abs(abs(a)-abs(b))+1<<endl;
      return 0;
    }
  }
}
# include <bits/stdc++.h>
typedef long long lint;
using namespace std;

lint gcd(lint x, lint y) {
  if(x == 0) { return y; }
  else { return gcd(y%x,x); }
}

lint lcm(lint x, lint y) { return x/gcd(x,y)*y; }


int main() {
  lint x,y,ans; cin >> x >> y;

  if(abs(x) == abs(y)) {
    ans = 1;
  } else if(abs(x) < abs(y)) {
    ans = abs(y)-abs(x);
    if(x < 0) { ans++; }
    if(y < 0) { ans++; }
  } else if(abs(x) > abs(y)) {
    ans = abs(x)- abs(y);
    if(x > 0) { ans++; }
    if(y > 0) { ans++; }
  }

  cout << ans << endl;
  return 0;
}