#include<bits/stdc++.h>
using namespace std;
int main()
{
	int	n,i,x,y1,y2,s;
	cin>>n>>y1>>y2;
	if(y1>y2){
int y2= (int)sqrt(n);
			s=y1+y2+2;
	}
	else{
int y1= (int)sqrt(n);
		s=y1+y2+2;
}
  cout<<s<<endl;
	return 0;
}