#!/usr/bin/env python3
import sys
input = sys.stdin.readline
INF = 10**9

h, a, d = map(int, input().split())
dp = [INF] * (h + 1)
dp[0] = 0
for i in range(1, h+1):
    # normal
    dp[i] = min(dp[i], dp[max(i-a, 0)] + 1)
    # special
    dp[i] = min(dp[i], dp[max(i-d, 0)] + 1.5)

print(dp[h])