1
n, a, b, c = map(int, input().split())
2
 
3
dp = [False for i in range(n + 1)]
4
dc = [0 for i in range(n + 1)]
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6
dp[0] = True
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dc[0] = 0
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9
for x in range(n + 1):
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    if dp[x] == True:
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        if x + a <= n:
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            dp[x + a] = True
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            dc[x + a] = max(dc[x + a], dc[x] + 1)
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        if x + b <= n:
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            dp[x + b] = True
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            dc[x + b] = max(dc[x + b], dc[x] + 1)
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        if x + c <= n:
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            dp[x + c] = True
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            dc[x + c] = max(dc[x + c], dc[x] + 1)
20
            
21
            
22
print(dc[n])