content: package v113;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.util.StringTokenizer;
  
  public class DiscretePursuit_UVa11335 {
  	
  	public static void main(String[] args) throws IOException {
  	
  		Scanner sc = new Scanner(System.in);
  		
  		while(sc.ready())
  		{
  			int a = sc.nextInt(),b = 0, u = sc.nextInt(), v = sc.nextInt();
  			
  			if(a == 0)
  				System.out.println(0);
  			else
  			{
  				int p1 = 0, p2 = 0,uCop = 0, vCop = 0;
  				int k1 = 0, k2 = 0;
  				while(true)
  				{
  					a += u;
  					p1 += ++uCop;
  					k1++;
  					if(a <= p1)
  						break;
  				}
  				
  				while(true)
  				{
  					b += v;
  					p2 += ++vCop;
  					k2++;
  					if(b <= p2)
  						break;
  				}
  				
  				System.out.println(Math.max(k1, k2));
  			}
  		}
  		
  		
  		
  	}
  	
  
  	static class Scanner 
  	{
  		StringTokenizer st;
  		BufferedReader br;
  
  		public Scanner(InputStream s){br = new BufferedReader(new InputStreamReader(s));}
  
  		public String next() throws IOException 
  		{
  			while (st == null || !st.hasMoreTokens()) 
  				st = new StringTokenizer(br.readLine());
  			return st.nextToken();
  		}
  
  		public int nextInt() throws IOException {return Integer.parseInt(next());}
  		
  		public long nextLong() throws IOException {return Long.parseLong(next());}
  
  		public String nextLine() throws IOException {return br.readLine();}
  
  		public boolean ready() throws IOException {return br.ready();}
  
  
  	}
  }
  