#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES

#ifdef _MSC_VER
#include "bits\stdc++.h"
#else
#include <bits/stdc++.h>
#endif
#include <vector>
#include <set>
#include <string>
#include <queue>
#include <list>
#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)
// #define rep(i,n) REP(i,1,n)
#define ll long long
#define ull unsigned ll
typedef long double ld;
#define SQR(X)  ( (X)*(X) )
#define CUBE(X) ( (X)*(X)*(X) )

// #define int ll

using namespace std;

signed main() {
  int i,j,k,l;
  int H,A,D;
  cin >> H >> A >> D;
  double dp[10005] = {0};
  for(i=1; i<=A; i++) dp[i] = 1;
  for(i=A+1; i<=H; i++) {
    dp[i] = dp[max(0,i-A)] + 1;
    dp[i] = min(dp[i],dp[max(0,i-D)]+1.5);
  }
  cout << dp[H] << endl;
  return 0;
}