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    if name == 'main': n = int(input())

    student = {}
    
    for _ in range(n):
        name, *line = input().split()
        scores = list(map(float, line))
        student[name] = scores
    
    avgForStudent = input()
    
    #iterating through all items in dict and calculating avg for all
    for k, v in student.items():
        #calculating avg for all keys present in dict
        student.update({k : sum(v)/len(v)})
    
    
    average = student.get(avgForStudent)
    print(f"{average:.2f}")