#include <bits/stdc++.h>
using namespace std;


int main(){
    int h,a,d;
    cin>>h>>a>>d;
    vector<double> attacks(h+1);
    for(int i=1;i<=h;i++){
        if(i<=a){
            attacks[i]=1;
        }else if(i>d){
            attacks[i]=(1+attacks[i-a]<attacks[i-d]+1.5)?(1+attacks[i-a]):(attacks[i-d]+1.5);
        }else{
            attacks[i]=(1+attacks[i-a]<1.5)?(1+attacks[i-a]):(1.5);
        }
    }
    cout<<attacks[h]<<endl;
}