题解 | #牛牛的小数输出#

num = float(input())
a = str(num).split('.')
def substr():
    a = str(num).split('.')
    if len(a[1]) < 2:
        a[1] = a[1] + str(0)
        return '.'.join(a)
    else:
        a[1] = a[1][0:2]
        return '.'.join(a)

a = substr()
print(a)