#include <bits/stdc++.h>
using namespace std;
int main(void) {
  uint64_t A, B, mid;
  int ok = 1e5, ng = 2;
  cin >> A >> B;
  while (abs(ok - ng) > 1) {
    mid = (ok + ng) / 2;
    if (4 * A * B < ((mid * mid) - A - B) * ((mid * mid) - A - B)) {
      ok = mid;
    } else {
      ng = mid;
    }
  }
  cout << mid << endl;
}