Main/Python/2022/S1.py


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N = int(input())

output = 0

seen = set()

for i in range(int(1 + N/4)):
    if (N - 4 * i) % 5 == 0:
        num_fives = (N - 4 * i) / 5
        if (i,num_fives) not in seen:
            output += 1
            seen.add((i,num_fives))

print(output)