#include <bits/stdc++.h>
using namespace std;
int main(void) {
  int64_t A, B, mid,ok = 1e5, ng = 2;
  cin >> A >> B;
  while (abs(ok - ng) > 1) {
    mid = (ok + ng) / 2;
    int64_t Y = ((mid * mid) - A - B);
    if (4 * A * B < Y * Y && mid * mid > A + B) {
      ok = mid;
    } else {
      ng = mid;
    }
  }
  cout << ok << endl;
}