# Given your current grade as the input, write a program to help you determine what score you need to get on a final to get an A (90% or higher) in a class 
# The syllabus states that the final is worth 40% of the overall 

# The input is an integer 
# The output should be a percentage rounded to one decimal place

# What we are defining for this code 
# Current Grade, Current points, points needed to get to 90%, and the grade on the final

currentGrade = int(input())
currentPoints = currentGrade * 0.6 # 60% 
pointsNeeded = 90 - currentPoints #Defines what points we need and will subtract the current points that were entered in 

#The final is worth 40% of the overall grade 
# 100%(total) - 40% (Final) = 60% Current Grade 

gradeOnFinal = pointsNeeded / 40 

print(str(round(gradeOnFinal, 3) * 100) + "%")
# the str is there because you're concatentating with the string % 
# In python, the + operator for strings only works when both sides are strings.