import sys

sys.setrecursionlimit(10 ** 6)
from itertools import *
from bisect import *
#from math import *
from collections import *
from heapq import *
from random import *
from decimal import *
import numpy as np

int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def MI(): return map(int, sys.stdin.readline().split())
def MI1(): return map(int1, sys.stdin.readline().split())
def MF(): return map(float, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LF(): return list(map(float, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
dij = [(0, 1), (1, 0), (0, -1), (-1, 0)]

def main():
    inf=10**6
    h,a,d=MI()
    dp=[inf]*(h+1)
    dp[0]=0
    for i in range(h):
        pre=dp[i]
        ni=min(i+a,h)
        dp[ni]=min(dp[ni],pre+1)
        ni=min(i+d,h)
        dp[ni]=min(dp[ni],pre+1.5)
    print(dp[h])

main()