usr bin env python3 total int input banknotes int value for value in i

#!/usr/bin/env python3

total = int(input())
banknotes = [int(value) for value in input().split()]
dp = [0] + [float('inf')] * total

for amount in range(total + 1):
	for banknote in banknotes:
		if amount >= banknote:
			dp[amount] = min(dp[amount], 1 + dp[amount - banknote])

print(dp[total])