finding_the_percentage

# Finding the percentage

# You have a record of N students. Each record contains the student's name, and their percent marks in Maths, Physics and Chemistry. The
# marks can be floating values. The user enters some integer N followed by the names and marks for N students. You are required to save
# the record in a dictionary data type. The user then enters a student's name. Output the average percentage marks obtained by that
# student, correct to two decimal places.

# Input Format
# The first line contains the integer N, the number of students. The next N lines contains the name and marks obtained by that student
# separated by a space. The final line contains the name of a particular student previously listed.

# Constraints
# 2 <= N <= 10
# 0 <= Marks <= 100

# Output Format
# Print one line: The average of the marks obtained by the particular student correct to 2 decimal places.


# Enter your code here. Read input from STDIN. Print output to STDOUT


-----------------------------------------------------------

def main():
    s=student_marks[query_name]
    s=sum(s)/3
    print("%.2f" %s)
    
if __name__ == '__main__':
    n = int(input())
    student_marks = {}
    for _ in range(n):
        name, *line = input().split()
        scores = list(map(float, line))
        student_marks[name] = scores
    query_name = input()
    main()