#include <bits/stdc++.h>
using namespace std;
int main(void) {
  uint64_t A, B, mid;
  int ok = 1e5, ng = 2, N;
  cin >> N;
  cin >> A >> B;
  for(int i = 0; i < N; i++){
	  while (abs(ok - ng) > 1) {
	    mid = (ok + ng) / 2;
	    uint64_t Y = ((mid * mid) - A - B);
	    if (4 * A * B < Y * Y && mid * mid > A + B) {
	      ok = mid;
	    } else {
	      ng = mid;
	    }
	  }
  }
  cout << ok << endl;
}