Finding the percentage

 The provided code stub will read in a dictionary containing key/value pairs of name:[marks] for a list of students. Print the average of the marks array for the student name provided, showing 2 places after the decimal.

Example



The query_name is 'beta'. beta's average score is .

Input Format

The first line contains the integer , the number of students' records. The next  lines contain the names and marks obtained by a student, each value separated by a space. The final line contains query_name, the name of a student to query.

Constraints

Output Format

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

Sample Input 0

3
Krishna 67 68 69
Arjun 70 98 63
Malika 52 56 60
Malika

Sample Output 0

56.00

Explanation 0

Marks for Malika are  whose average is 

Sample Input 1

2
Harsh 25 26.5 28
Anurag 26 28 30
Harsh

Sample Output 1

26.50

if __name__ == '__main__':
    n = int(input())
    
    names=[]
    marks=[]
    for _ in range(n):
        a=input().split()
        names.append(a[0])
        marks.append(a[1:])
    query=input()
    # print(names)
    # print(marks)
    idx = names.index(query)
    #print(marks[idx])
    sum=0
    for i in marks[idx]:
        sum+=float(i)
        
    print("%0.2f"%(sum/len(marks[idx])))
        

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