from decimal import Decimal, ROUND_HALF_UP
num = float(input())
print(Decimal(num).quantize(Decimal('0'), rounding=ROUND_HALF_UP))


# 四舍五入4.5会变成4，详细信息看链接
#  https://blog.csdn.net/xo3ylAF9kGs/article/details/127020005