题解 | #取近似值#

import sys

#for line in sys.stdin:
 #   a = line.split()
 #   print(int(a[0]) + int(a[1]))

s = input()
list1 = s.split(".")
#print(list1)
#为了防止说float的小数位数太多，取小数位数的第一位就行了list1[1][0])
if int(list1[1][0])>=5:
 #   print(list1[1])    
    res=str(int(list1[0])+1)
    list1[0]=res
 #   print(list1[0])
else:
    pass
print(list1[0])