题解 | #杨辉三角的变形#
杨辉三角的变形
https://www.nowcoder.com/practice/8ef655edf42d4e08b44be4d777edbf43
n = int(input())
if n == 1 or n == 2:
print("-1")
else:
if n % 2 == 1:
print("2")
elif n%4 == 0:
print("3")
else:
print(4)
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