#include <iostream>
using namespace std;

int main() {
  int a, b;
  cin >> a >> b;
  int cnt;
  if (a < b) {
    for (int i=1; i< b && i <= 2000000000; ++i) {
      cnt++;
    }
  } else {
    for (int i=2000000000; i> b && i >= 1; --i) {
      cnt++;
    }
  }
  cout << cnt -1<< endl;
  return 0;
}