#include "bits/stdc++.h"
using namespace std;
#define print(x) cout<<x<<endl;
#define rep(i,a,b) for(int i=a;i<b;i++)
#define REP(i,a) for(int i=0;i<a;i++)
#define printall(n,array) for(int i=0;i<n;i++){cout<<array[i]<<" ";}cout<<endl;
typedef long long ll;
typedef pair<int, int> PI;
typedef pair<int, PI> V;
typedef vector<int> VE;
const ll mod = 1000000007; //10^9+7

int h,a,d;
double dp[20101];
int main(){
  cin>>h>>a>>d;
  REP(i,h+1)dp[i]=mod;
  REP(i,a+1)dp[i]=ceil(double(i)/double(a));
  if(d>a){
    REP(i,d+1){
      dp[i]=min(dp[i],1.5);
    }
  }

  REP(i,h+1){
    dp[i+a]=min(dp[i+a],dp[i]+1);
    dp[i+d]=min(dp[i+d],dp[i]+1.5);
  }
  //printall(h+1,dp);
  print(dp[h]);
}