#include <bits/stdc++.h>

using namespace std;
const int MAX = (int)2e9;

int main() {
  int A, B;
  scanf("%d %d", &A, &B);
  if (A > B) {
    cout << MAX - A << endl;
  } else {
    cout << B - A << endl;
  }
  return 0;
}